Platypus

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(Redirected from
Duck-billed platypus
)
For other uses, see Platypus (disambiguation).

Platypus
Temporal range: 9–0 
Ma
 Miocene to Recent
Wild Platypus 4.jpg

Near Threatened (IUCN 3.1)[1]
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Monotremata
Family: Ornithorhynchidae
Genus: Ornithorhynchus
Blumenbach, 1800
Species:
O. anatinus
Binomial name
Ornithorhynchus anatinus
(Shaw, 1799)
Distribution of the Platypus (Ornithorhynchus anatinus).png
Platypus range
(red – native, yellow – introduced)
Synonyms[2]
  • Ornithorhynchus agilis (de Vis, 1886)
  • Platypus anatinus (Shaw, 1799)

The platypus (Ornithorhynchus anatinus),

related species
appear in the fossil record.

Together with the four species of

venomous mammals, as the male platypus has a spur on the hind foot that delivers a venom, capable of causing severe pain to humans. The unusual appearance of this egg-laying, duck-billed, beaver-tailed, otter
-footed mammal baffled European naturalists when they first encountered it. In 1799, the first scientists to examine a preserved platypus body judged it a fake, made of several animals sewn together.

The unique features of the platypus make it an important subject in the study of evolutionary biology, and a recognisable and iconic symbol of Australia. It is culturally significant to several Aboriginal peoples of Australia, who also used to hunt the animal for food. It has appeared as a mascot at national events and features on the reverse of the Australian twenty-cent coin, and the platypus is the animal emblem of the state of New South Wales. Until the early 20th century, humans hunted the platypus for its fur, but it is now protected throughout its range. Although captive-breeding programs have had only limited success, and the platypus is vulnerable to the effects of pollution, it is not under any immediate threat.

As of 2020, the platypus is a legally

EPBC Act, due to habitat destruction
and declining numbers in all states.

Taxonomy and naming

See also: Plural form of words ending in -us
Frederick Nodder
's illustration from the first scientific description in 1799 of "Platypus anatinus"

When the platypus was first encountered by Europeans in 1798, a

pelt and sketch were sent back to Great Britain by Captain John Hunter, the second Governor of New South Wales.[5] British scientists' initial hunch was that the attributes were a hoax.[6] George Shaw, who produced the first description of the animal in the Naturalist's Miscellany in 1799, stated it was impossible not to entertain doubts as to its genuine nature,[7] and Robert Knox believed it might have been produced by some Asian taxidermist.[6] It was thought that somebody had sewn a duck's beak onto the body of a beaver-like animal. Shaw even took a pair of scissors to the dried skin to check for stitches.[8][7]

The common name "platypus" literally means 'flat-foot', deriving from the

Sir Joseph Banks)[15] and following the rules of priority of nomenclature, it was later officially recognised as Ornithorhynchus anatinus.[14]

There is no universally-agreed plural form of "platypus" in the English language. Scientists generally use "platypuses" or simply "platypus". Colloquially, the term "platypi" is also used for the plural, although this is a form of pseudo-Latin;[8] going by the word's Greek roots the plural would be "platypodes". Early British settlers called it by many names, such as "watermole", "duckbill", and "duckmole".[8] Occasionally it is specifically called the "duck-billed platypus".

The scientific name Ornithorhynchus anatinus literally means 'duck-like bird-snout',

species name is derived from Latin anatinus ('duck-like') from anas 'duck'.[13][18] The platypus is the sole living representative or monotypic taxon of its family (Ornithorhynchidae).[19]

Description

Platypus in Broken River, Queensland

In David Collins's account of the new colony 1788–1801, he describes coming across "an amphibious animal, of the mole species". His account includes a drawing of the animal.[20]

The body and the broad, flat tail of the platypus are covered with dense, brown, biofluorescent fur that traps a layer of insulating air to keep the animal warm.[8][14][21] The fur is waterproof, and the texture is akin to that of a mole.[22] The platypus uses its tail for storage of fat reserves (an adaptation also found in animals such as the Tasmanian devil[23]). The webbing on the feet is more significant on the front feet and is folded back when walking on land. The elongated snout and lower jaw are covered in soft skin, forming the bill. The nostrils are located on the dorsal surface of the snout, while the eyes and ears are located in a groove set just back from it; this groove is closed when swimming.[14] Platypuses have been heard to emit a low growl when disturbed and a range of other vocalisations have been reported in captive specimens.[8]

A colour print of platypuses from 1863

Weight varies considerably from 0.7 to 2.4 kg (1 lb 9 oz to 5 lb 5 oz), with males being larger than females. Males average 50 cm (20 in) in total length, while females average 43 cm (17 in),[14] with substantial variation in average size from one region to another. This pattern does not seem to follow any particular climatic rule and may be due to other environmental factors, such as predation and human encroachment.[24]

The platypus has an average

body temperature of about 32 °C (90 °F) rather than the 37 °C (99 °F) typical of placental mammals.[25] Research suggests this has been a gradual adaptation to harsh environmental conditions on the part of the small number of surviving monotreme species rather than a historical characteristic of monotremes.[26][27]

Modern platypus young have three teeth in each of the

vertebrates, the bones show osteosclerosis, increasing their density to provide ballast.[31] It has a reptilian gait, with the legs on the sides of the body, rather than underneath.[14] When on land, it engages in knuckle-walking on its front feet, to protect the webbing between the toes.[32]

Venom

Main article: Platypus venom
The calcaneus spur found on the male's hind limb is used to deliver venom.

While both male and female platypuses are born with ankle spurs, only the spurs on the male's back ankles deliver venom,[33][34][35] composed largely of defensin-like proteins (DLPs), three of which are unique to the platypus.[36] The DLPs are produced by the immune system of the platypus. The function of defensins is to cause lysis in pathogenic bacteria and viruses, but in platypuses they also are formed into venom for defence. Although powerful enough to kill smaller animals such as dogs, the venom is not lethal to humans, but the pain is so excruciating that the victim may be incapacitated.[36][37] Oedema rapidly develops around the wound and gradually spreads throughout the affected limb. Information obtained from case histories and anecdotal evidence indicates the pain develops into a long-lasting hyperalgesia (a heightened sensitivity to pain) that persists for days or even months.[38][39] Venom is produced in the crural glands of the male, which are kidney-shaped alveolar glands connected by a thin-walled duct to a calcaneus spur on each hind limb. The female platypus, in common with echidnas, has rudimentary spur buds that do not develop (dropping off before the end of their first year) and lack functional crural glands.[14]

The venom appears to have a different function from those produced by non-mammalian species; its effects are not life-threatening to humans, but nevertheless powerful enough to seriously impair the victim. Since only males produce venom and production rises during the breeding season, it may be used as an offensive weapon to assert dominance during this period.[36]

Similar spurs are found on many archaic mammal groups, indicating that this is an ancient characteristic for mammals as a whole, and not exclusive to the platypus or other monotremes.[40]

Electrolocation

The platypus has secondarily acquired electroreception. Its receptors are arranged in stripes on its bill, giving it high sensitivity to the sides and below; it makes quick turns of its head as it swims to detect prey.[41]

electroreception: they locate their prey in part by detecting electric fields generated by muscular contractions. The platypus's electroreception is the most sensitive of any monotreme.[43][41]

The

somatotopic map of the platypus brain, in the same way human hands dominate the Penfield homunculus map.[44][45]

The platypus can determine the direction of an electric source, perhaps by comparing differences in

signal strength across the sheet of electroreceptors. This would explain the characteristic side-to-side motion of the animal's head while hunting. The cortical convergence of electrosensory and tactile inputs suggests a mechanism that determines the distance of prey that, when they move, emit both electrical signals and mechanical pressure pulses. The platypus uses the difference between arrival times of the two signals to sense distance.[41]

Feeding by neither sight nor smell,[46] the platypus closes its eyes, ears, and nose each time it dives.[47] Rather, when it digs in the bottom of streams with its bill, its electroreceptors detect tiny electric currents generated by muscular contractions of its prey, so enabling it to distinguish between animate and inanimate objects, which continuously stimulate its mechanoreceptors.[41] Experiments have shown the platypus will even react to an "artificial shrimp" if a small electric current is passed through it.[48]

Monotreme electrolocation probably evolved in order to allow the animals to forage in murky waters, and may be tied to their tooth loss.[49] The extinct Obdurodon was electroreceptive, but unlike the modern platypus it foraged pelagically (near the ocean surface).[49]

Eyes

In recent studies it has been suggested that the eyes of the platypus are more similar to those of Pacific hagfish or Northern Hemisphere lampreys than to those of most tetrapods. The eyes also contain double cones, which most mammals do not have.[50]

Although the platypus's eyes are small and not used under water, several features indicate that vision played an important role in its ancestors. The

visual midbrain plays a more important role than the visual cortex, as in some rodents. These features suggest that the platypus has adapted to an aquatic and nocturnal lifestyle, developing its electrosensory system at the cost of its visual system; an evolutionary process paralleled by the small number of electroreceptors in the short-beaked echidna, which dwells in dry environments, whilst the long-beaked echidna, which lives in moist environments, is intermediate between the other two monotremes.[44]

Biofluorescence

In 2020, research in biofluorescence revealed that the platypus glows a bluish-green color when exposed to black light.[51]

Distribution, ecology, and behaviour

Dentition, as illustrated in Knight's Sketches in Natural History
Platypus swimming
Sydney Aquarium
, Australia

The platypus is semiaquatic, inhabiting small streams and rivers over an extensive range from the cold highlands of Tasmania and the Australian Alps to the tropical rainforests of coastal Queensland as far north as the base of the Cape York Peninsula.[52]

Inland, its distribution is not well known. It was considered extinct on the

Warrawong Sanctuary (see below) in the 1980s, setting a platypus breeding program there, and it had subsequently closed.[54][55] In 2017 there were some unconfirmed sightings downstream, outside the sanctuary,[53] and in October 2020 a nesting platypus was filmed inside the recently reopened sanctuary.[56] There is a population on Kangaroo Island[57] introduced in the 1920s, which was said to stand at 150 individuals in the Rocky River region of Flinders Chase National Park before the 2019–20 Australian bushfire season, in which large portions of the island burnt, decimating all wildlife. However, with the SA Department for Environment and Water recovery teams working hard to reinstate their habitat, there had been a number of sightings reported by April 2020.[58]

The platypus is no longer found in the main part of the

Murray-Darling Basin, possibly due to the declining water quality brought about by extensive land clearing and irrigation schemes.[59] Along the coastal river systems, its distribution is unpredictable; it appears to be absent from some relatively healthy rivers, and yet maintains a presence in others, for example, the lower Maribyrnong, that are quite degraded.[60]

In captivity, platypuses have survived to 17 years of age, and wild specimens have been recaptured when 11 years old.

crepuscular, but individuals are also active during the day, particularly when the sky is overcast.[62][63] Its habitat bridges rivers and the riparian zone for both a food supply of prey species, and banks where it can dig resting and nesting burrows.[63] It may have a range of up to 7 km (4.3 mi), with a male's home range overlapping those of three or four females.[64]

The platypus is an excellent swimmer and spends much of its time in the water foraging for food. It has a very characteristic swimming style and no external ears.[65] Uniquely among mammals, it propels itself when swimming by an alternate rowing motion of the front feet; although all four feet of the platypus are webbed, the hind feet (which are held against the body) do not assist in propulsion, but are used for steering in combination with the tail.[66] The species is endothermic, maintaining its body temperature at about 32 °C (90 °F), lower than most mammals, even while foraging for hours in water below 5 °C (41 °F).[14]

Dives normally last around 30 seconds, but can last longer, although few exceed the estimated aerobic limit of 40 seconds. Recovery at the surface between dives commonly takes from 10 to 20 seconds.[67][68]

When not in the water, the platypus retires to a short, straight resting burrow of oval cross-section, nearly always in the riverbank not far above water level, and often hidden under a protective tangle of roots.[65]

The average sleep time of a platypus is said to be as long as 14 hours per day, possibly because it eats

crustaceans, which provide a high level of calories.[69]

Diet

The platypus is a carnivore: it feeds on annelid worms, insect larvae, freshwater shrimp, and freshwater yabby (crayfish) that it digs out of the riverbed with its snout or catches while swimming. It uses cheek-pouches to carry prey to the surface, where it is eaten.[65] The platypus needs to eat about 20% of its own weight each day, which requires it to spend an average of 12 hours daily looking for food.[67]

Reproduction

Platypus's nest with eggs (replica)

When the platypus was first encountered by European naturalists, they were divided over whether the female lays eggs. This was finally confirmed by William Hay Caldwell's team in 1884.[14][36]

The species exhibits a single

breeding season; mating occurs between June and October, with some local variation taking place between different populations across its range.[61] Historical observation, mark-and-recapture studies, and preliminary investigations of population genetics indicate the possibility of both resident and transient members of populations, and suggest a polygynous mating system.[70] Females are thought likely to become sexually mature in their second year, with breeding confirmed still to take place in animals over nine years old.[70]

Outside the mating season, the platypus lives in a simple ground burrow, the entrance of which is about 30 cm (12 in) above the water level. After mating, the female constructs a deeper, more elaborate burrow up to 20 m (65 ft) long and blocked at intervals with plugs (which may act as a safeguard against rising waters or predators, or as a method of regulating humidity and temperature).[71] The male takes no part in caring for his young, and retreats to his year-long burrow. The female softens the ground in the burrow with dead, folded, wet leaves, and she fills the nest at the end of the tunnel with fallen leaves and reeds for bedding material. This material is dragged to the nest by tucking it underneath her curled tail.[8]

The female platypus has a pair of

incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally).[62] After laying her eggs, the female curls around them. The incubation period is divided into three phases.[74] In the first phase, the embryo has no functional organs and relies on the yolk sac for sustenance. The yolk is absorbed by the developing young.[75] During the second phase, the digits develop, and in the last phase, the egg tooth appears.[74]

Most mammal zygotes go through

monotremes like the platypus and in non-mammals like reptiles and birds. In meroblastic cleavage, the ovum does not split completely. This causes the cells at the edge of the yolk to be cytoplasmically continuous with the egg's cytoplasm. This allows the yolk, which contains the embryo, to exchange waste and nutrients with the cytoplasm.[76]

There is no official term for platypus young, but the term "platypup" sees unofficial use, as does "puggle".[77][78] Newly hatched platypuses are vulnerable, blind, and hairless, and are fed by the mother's milk. Although possessing mammary glands, the platypus lacks teats. Instead, milk is released through pores in the skin. The milk pools in grooves on her abdomen, allowing the young to lap it up.[8][61] After they hatch, the offspring are milk-fed for three to four months. During incubation and weaning, the mother initially leaves the burrow only for short periods, to forage. When doing so, she creates a number of thin soil plugs along the length of the burrow, possibly to protect the young from predators; pushing past these on her return forces water from her fur and allows the burrow to remain dry.[79] After about five weeks, the mother begins to spend more time away from her young, and at around four months, the young emerge from the burrow.[61] A platypus is born with teeth, but these drop out at a very early age, leaving the horny plates it uses to grind food.[28]

Evolution

Platypus

Echidnas

 live birth 

Marsupials

 true placenta 

Eutherians

Evolutionary relationships between the platypus and other mammals[80]

The platypus and other monotremes were very poorly understood, and some of the 19th century myths that grew up around them – for example, that the monotremes were "inferior" or quasireptilian – still endure.[81] In 1947, William King Gregory theorised that placental mammals and marsupials may have diverged earlier, and a subsequent branching divided the monotremes and marsupials, but later research and fossil discoveries have suggested this is incorrect.[81][82] In fact, modern monotremes are the survivors of an early branching of the mammal tree, and a later branching is thought to have led to the marsupial and placental groups.[81][83] Molecular clock and fossil dating suggest platypuses split from echidnas around 19–48 million years ago.[84]

Reconstruction of ancient platypus relative Steropodon

The oldest discovered fossil of the modern platypus dates back to about 100,000 years ago, during the

tribosphenic, which would have supported a variation of Gregory's theory, but later research has suggested, while they have three cusps, they evolved under a separate process.[86] The fossil is thought to be about 110 million years old, making it the oldest mammal fossil found in Australia. Unlike the modern platypus (and echidnas), Teinolophos lacked a beak.[85]

Obdurodon tharalkooschild, was dated 5–15 million years ago. Judging by the tooth, the animal measured 1.3 metres long, making it the largest platypus on record.[88]

Platypus skeleton

Because of the early divergence from the

SRY, a study found that the mechanism of sex determination is the AMH gene on the oldest Y chromosome.[92][93] A draft version of the platypus genome sequence was published in Nature on 8 May 2008, revealing both reptilian and mammalian elements, as well as two genes found previously only in birds, amphibians, and fish. More than 80% of the platypus's genes are common to the other mammals whose genomes have been sequenced.[46] An updated genome, the most complete on record, was published in 2021, together with the genome of the short-beaked echidna.[94]

Conservation

A depiction of a platypus from a book for children published in Germany in 1798

Status and threats

Except for its loss from the state of South Australia, the platypus occupies the same general distribution as it did prior to

fisheries.[59]

The

National Parks and Wildlife Act 1972. In 2020 it has been recommended to be listed as a vulnerable species in Victoria under the state's Flora and Fauna Guarantee Act 1988.[96]

Habitat destruction

The platypus is not considered to be in immediate danger of extinction, because conservation measures have been successful, but it could be adversely affected by habitat disruption caused by

EPBC Act.[97][98]

Researchers have worried for years that declines have been greater than assumed.

land clearing, climate change and severe drought.[99][100] The study predicted that, considering current threats, the animals' abundance would decline by 47%–66% and metapopulation occupancy by 22%–32% over 50 years, causing "extinction of local populations across about 40% of the range". Under projections of climate change projections to 2070, reduced habitat due to drought would lead to 51–73% reduced abundance and 36–56% reduced metapopulation occupancy within 50 years respectively. These predictions suggested that the species would fall under the "Vulnerable" classification. The authors stressed the need for national conservation efforts, which might include conducting more surveys, tracking trends, reduction of threats and improvement of river management to ensure healthy platypus habitat.[101] Co-author Gilad Bino is concerned that the estimates of the 2016 baseline numbers could be wrong, and numbers may have been reduced by as much as half already.[97]

A November 2020 report by scientists from the

Murray-Darling Basin.[103][104][96]

Disease

Platypuses generally suffer from few

Mucor amphibiorum. The disease (termed mucormycosis) affects only Tasmanian platypuses, and had not been observed in platypuses in mainland Australia. Affected platypuses can develop skin lesions or ulcers on various parts of their bodies, including their backs, tails, and legs. Mucormycosis can kill platypuses, death arising from secondary infection and by affecting the animals' ability to maintain body temperature and forage efficiently. The Biodiversity Conservation Branch at the Department of Primary Industries and Water collaborated with NRM north and University of Tasmania researchers to determine the impacts of the disease on Tasmanian platypuses, as well as the mechanism of transmission and spread of the disease.[105]

Wildlife sanctuaries

Platypus House at Lone Pine Koala Sanctuary
in Brisbane, Queensland

Much of the world was introduced to the platypus in 1939 when

Victoria. The leading figure in these efforts was David Fleay, who established a platypusary (a simulated stream in a tank) at the Healesville Sanctuary, where breeding was successful in 1943.[106] In 1972, he found a dead baby of about 50 days old, which had presumably been born in captivity, at his wildlife park at Burleigh Heads on the Gold Coast, Queensland.[107] Healesville repeated its success in 1998 and again in 2000 with a similar stream tank.[108] Since 2008, platypus has bred regularly at Healesville,[109] including second-generation (captive born themselves breeding in captivity).[110] Taronga Zoo in Sydney bred twins in 2003, and breeding was again successful there in 2006.[108]

Captivity

As of 2019, the only platypuses in captivity outside of Australia are in the San Diego Zoo Safari Park in the U.S. state of California.[111][112] Three attempts were made to bring the animals to the Bronx Zoo, in 1922, 1947, and 1958; of these, only two of the three animals introduced in 1947, Penelope and Cecil,[113] lived longer than eighteen months.[114]

Human interactions

Usage

A platypus fur cape made in 1890. It was donated to the National Gallery of Victoria by Mrs F Smith in 1985

Aboriginal Australians used to hunt platypuses for food (their fatty tails being particularly nutritious), while, after colonisation, Europeans hunted them for fur from the late 19th century and until 1912, when it was prohibited by law. In addition, European researchers captured and killed platypus or removed their eggs, partly in order to increase scientific knowledge, but also to gain prestige and outcompete rivals from different countries.[96]

Cultural references

9d postage stamp from 1937

The platypus has been a subject in the

Dreamtime stories of Aboriginal Australians, some of whom believed the animal was a hybrid of a duck and a water rat.[115]
: 57–60 

According to one story of the upper Darling River,[96] the major animal groups, the land animals, water animals and birds, all competed for the platypus to join their respective groups, but the platypus ultimately decided to not join any of them, feeling that he did not need to be part of a group to be special,[115]: 83–85  and wished to remain friends with all of those groups.[96] Another Dreaming story emanate of the upper Darling tells of a young duck which ventured too far, ignoring the warnings of her tribe, and was kidnapped by a large water-rat called Biggoon. After managing to escape after some time, she returned and laid two eggs which hatched into strange furry creatures, so they were all banished and went to live in the mountains.[96]

matchbox
label art

The platypus is also used by some

connection to country, the platypus is protected and conserved by these Indigenous peoples.[96]

The platypus has often been used as a symbol of Australia's

Second World War, in order to strengthen ties and boost morale.[96]

Platypuses have been used several times as mascots: Syd the platypus was one of the three mascots chosen for the

BSD-based core of macOS and other operating systems from Apple Inc.[118]

Since the introduction of

decimal currency to Australia in 1966, the embossed image of a platypus, designed and sculpted by Stuart Devlin, has appeared on the reverse (tails) side of the 20-cent coin.[119] The platypus has frequently appeared in Australian postage stamps, most recently the 2015 "Native Animals" series and the 2016 "Australian Animals Monotremes" series.[120][121]

In the American animated series Phineas and Ferb (2007–2015), the title characters own a pet bluish-green platypus named Perry who, unknown to them, is a secret agent. Such choices were inspired by media underuse, as well as to exploit the animal's striking appearance;[122] additionally, show creator Dan Povenmire, who also wrote the character's theme song, said that its opening lyrics are based on the introductory sentence of the Platypus article on Wikipedia, copying the "semiaquatic egg-laying mammal" phrase word for word, and appending the phrase "of action".[123] As a character, Perry has been well received by both fans and critics.[124][125] Coincidentally, real platypuses show a similar cyan color when seen under ultraviolet lighting.[126]

See also

Citations

  1. ^
    doi:10.2305/IUCN.UK.2016-1.RLTS.T40488A21964009.en
    . Retrieved 19 November 2021.
  2. ^ "Ornithorhynchus anatinus". Global Biodiversity Information Facility. Retrieved 13 July 2021.
  3. OCLC 62265494
    .
  4. doi:10.5962/p.304567
    .
  5. JSTOR 1313511
    .
  6. ^ a b "Duck-billed Platypus". Museum of hoaxes. Archived from the original on 29 July 2014. Retrieved 21 July 2010.
  7. ^
    doi:10.5962/p.304567. Archived
    from the original on 1 October 2020. Retrieved 6 October 2020 – via Biodiversity Heritage Library.
  8. ^ a b c d e f g "Platypus facts file". Australian Platypus Conservancy. Archived from the original on 10 November 2015. Retrieved 13 September 2006.
  9. ^ πλατύπους Archived 25 February 2021 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
  10. ^ πλατύς Archived 25 February 2021 at the Wayback Machine, A Greek-English Lexicon, on Perseus
  11. ^ πούς Archived 27 February 2021 at the Wayback Machine, A Greek-English Lexicon, on Perseus
  12. ISBN 978-0-19-910207-5
    .
  13. ^
    doi:10.5962/p.304567. Archived
    from the original on 1 October 2020. Retrieved 6 October 2020.
  14. ^ a b c d e f g h i j k l m n o Grant, J.R. "16" (PDF). Fauna of Australia. Vol. 1b. Australian Biological Resources Study (ABRS). Archived from the original (PDF) on 19 May 2005. Retrieved 13 September 2006.
  15. ^ "Platypus Paradoxes". National Library of Australia. August 2001. Archived from the original on 5 March 2012. Retrieved 14 September 2006.
  16. ^ Liddell, Henry George; Scott, Robert (1940). "ὄρνις". A Greek-English Lexicon. Perseus Digital Library.
  17. ^ Liddell, Henry George; Scott, Robert (1940). "ῥύγχος". A Greek-English Lexicon. Perseus Digital Library.
  18. ^ Lewis, Charlton T.; Short, Charles (1879). "ănăs". A Latin Dictionary. Perseus Digital Library.
  19. ^ Bess, Anna. "ADW: Ornithorhynchidae: INFORMATION". Animaldiversity.org. Archived from the original on 17 January 2022. Retrieved 11 February 2022.
  20. ^ Collins, David. An Account of the English Colony in New South Wales, Volume 2. Retrieved 5 July 2017 – via Internet Archive.
  21. doi:10.1515/mammalia-2020-0027
    .
  22. ^ "Platypus: Facts, Pictures: Animal Planet". Animal.discovery.com. 16 November 2011. Archived from the original on 27 July 2011. Retrieved 8 September 2012.
  23. ISBN 978-0-207-14454-7
    .
  24. ^ a b Munks, Sarah & Nicol, Stewart (May 1999). "Current research on the platypus, Ornithorhynchus anatinus in Tasmania: Abstracts from the 1999 'Tasmanian Platypus Workshop'". University of Tasmania. Archived from the original on 30 August 2006. Retrieved 23 October 2006.
  25. ^ "Thermal Biology of the Platypus". Davidson College. 1999. Archived from the original on 6 March 2012. Retrieved 14 September 2006.
  26. doi:10.1071/ZO9880573
    .
  27. doi:10.1071/ZO9790511
    .
  28. ^
    ISBN 978-0-313-33922-6
    .
  29. ^ Haeckel (1895). Systematische Phylogenie der Wirbelthiere (Vertebrata). Entwurf einer systematischen Stammesgeschichte (in German). Vol. 3 (1 ed.). Berlin: Georg Reimer. pp. 142–143. Archived from the original on 16 July 2021. Retrieved 16 July 2021.
  30. ISBN 978-0-801-89668-2
    .
  31. PMID 23565143
    .
  32. PMID 11171362
    .
  33. ^ "Australian Fauna". Australian Fauna. Archived from the original on 29 May 2012. Retrieved 14 May 2010.
  34. ^ "Platypus venom linked to pain relief". University of Sydney. 8 May 2008. Archived from the original on 21 August 2011. Retrieved 14 May 2010.
  35. ^ "Platypus poison". Rainforest Australia. Archived from the original on 29 May 2010. Retrieved 14 May 2010.
  36. ^ a b c d Gerritsen, Vivienne Baillie (December 2002). "Platypus poison". Protein Spotlight (29). Archived from the original on 20 October 2008. Retrieved 14 September 2006.
  37. Cosmos
    .
  38. S2CID 2452708. Archived
    from the original on 21 July 2021. Retrieved 1 December 2019.
  39. ^ "The venom of the platypus (Ornithorhynchus anatinus)". Archived from the original on 1 February 2012. Retrieved 13 September 2006.
  40. ^ Jørn H. Hurum, Zhe-Xi Luo, and Zofia Kielan-Jaworowska, Were mammals originally venomous?, Acta Palaeontologica Polonica 51 (1), 2006: 1–11
  41. ^
    PMID 10210685. Archived
    (PDF) from the original on 28 September 2006. Retrieved 19 September 2006.
  42. PMID 21795271
    .
  43. PMID 9720114
    .
  44. ^
    PMID 9720115
    .
  45. ISBN 978-0-618-00583-3
    .
  46. ^
    PMID 18464734
    .
  47. PMID 3418529
    .
  48. ^ Manning, A.; Dawkins, M.S. (1998). An Introduction to Animal Behaviour (5th ed.). Cambridge University Press.
  49. ^
    doi:10.1126/sciadv.1601329
    .
  50. S2CID 28546474
    .
  51. ^ November 2020, Mindy Weisberger-Senior Writer 02 (2 November 2020). "Platypuses glow an eerie blue-green under UV light". livescience.com. Archived from the original on 5 November 2020. Retrieved 7 November 2020.
  52. ^ "Platypus". Department of Primary Industries and Water, Tasmania. 31 August 2006. Archived from the original on 9 October 2006. Retrieved 12 October 2006.
  53. ^ a b Sutton, Malcolm (3 May 2017). "Platypus 'sighting' in the Adelaide Hills sparks camera set-up to capture extinct species - ABC News". ABC (Australian Broadcasting Corporation). Archived from the original on 26 November 2020. Retrieved 12 October 2020.
  54. ^ Keogh, Melissa (3 October 2018). "Life reinstated to much-loved Warrawong Wildlife Sanctuary". The Lead SA. Archived from the original on 12 October 2020. Retrieved 12 October 2020.
  55. ^ Adams, Prue (27 March 2005). "Wamsley walks away from Earth Sanctuaries". Landline. Australian Broadcasting Corporation. Archived from the original on 12 October 2020. Retrieved 12 October 2020.
  56. ^ Sutton, Malcolm (1 October 2020). "V6 Commodore water pump gets the tick from nesting platypus at Warrawong". ABC News. Australian Broadcasting Corporation. Archived from the original on 7 October 2020. Retrieved 7 October 2020.
  57. ^ "Research on Kangaroo Island". University of Adelaide. 4 July 2006. Archived from the original on 6 July 2004. Retrieved 23 October 2006.
  58. ^ "Find out how platypuses are faring on Kangaroo Island following the bushfires". Department for Environment and Water. 7 April 2020. Archived from the original on 21 July 2021. Retrieved 12 October 2020.
  59. ^ a b Scott, Anthony; Grant, Tom (November 1997). "Impacts of water management in the Murray-Darling Basin on the platypus (Ornithorhynchus anatinus) and the water rat (Hydromus chrysogaster)" (PDF). CSIRO Australia. Archived (PDF) from the original on 15 March 2016. Retrieved 23 October 2006.
  60. ^ "Platypus in Country Areas". Australian Platypus Conservancy. Archived from the original on 17 September 2016. Retrieved 23 October 2006.
  61. ^ a b c d "Platypus". Environmental Protection Agency/Queensland Parks and Wildlife Service. 2006. Archived from the original on 21 October 2009. Retrieved 24 July 2009.
  62. ^ a b c Cromer, Erica (14 April 2004). "Monotreme Reproductive Biology and Behavior". Iowa State University. Archived from the original on 13 March 2009. Retrieved 18 June 2009.
  63. ^
    PMID 9720106
    .
  64. doi:10.1071/ZO9950091
    .
  65. ^ a b c "Platypus in Tasmania | Department of Primary Industries, Parks, Water and Environment, Tasmania". dpipwe.tas.gov.au. Archived from the original on 8 March 2020. Retrieved 10 April 2020.
  66. PMID 9359371. Archived
    (PDF) from the original on 26 September 2009. Retrieved 23 October 2006.
  67. ^ a b Philip Bethge (April 2002). "Energetics and foraging behaviour of the platypus". University of Tasmania. Archived from the original on 25 October 2018. Retrieved 21 June 2009.
  68. JSTOR 2404239
    .
  69. ^ Holland, Jennifer S. (July 2011). "40 Winks?". National Geographic. 220 (1).
  70. ^
    doi:10.1071/ZO9830881
    .
  71. ^ Anna Bess Sorin & Phil Myers (2001). "Family Ornithorhynchidae (platypus)". University of Michigan Museum of Zoology. Archived from the original on 10 April 2011. Retrieved 24 October 2006.
  72. S2CID 8379688
    .
  73. PMID 9720108
    .
  74. ^
    PMID 9720109
    .
  75. ^ "Ockhams Razor". The Puzzling Platypus. 20 July 2001. Archived from the original on 9 August 2017. Retrieved 2 December 2006.
  76. ^ Myers, P. Z. (2008). "Interpreting Shared Characteristics: The Platypus Genome". Nature Education. 1 (1): 462008. Archived from the original on 4 March 2018. Retrieved 26 March 2015.
  77. ^ Carmody, Judy (2011). Wet Tropics of Queensland World Heritage Area: Tour Guide Handbook (PDF). James Cook University, Marine and Tropical Science Research Facility. Archived (PDF) from the original on 7 June 2020. Retrieved 8 February 2021.
  78. ^ Australian National Dictionary Centre (November 2017). "Oxford Word of the Month - November: platypup" (PDF). Oxford University Press. Retrieved 20 April 2022.
  79. ^ a b "Egg-laying mammals" (PDF). Queensland Museum. November 2000. Archived from the original (PDF) on 22 July 2008. Retrieved 19 June 2009.
  80. ISBN 978-0-674-02183-9
    . Retrieved 28 March 2015.
  81. ^
    PMID 9720117
    .
  82. ^
    S2CID 4346804
    .
  83. S2CID 39638466
    .
  84. PMID 19805098
    .
  85. ^
    S2CID 89034974
    .
  86. ^ a b Pascual, R.; Goin, F.J.; Balarino, L.; Udrizar Sauthier, D.E. (2002). "New data on the Paleocene monotreme Monotrematum sudamericanum, and the convergent evolution of triangulate molars" (PDF). Acta Palaeontologica Polonica. 47 (3): 487–492. Archived (PDF) from the original on 9 August 2017. Retrieved 18 March 2009.
  87. ^ Folger, Tim (1993). "A platypus in Patagonia (Ancient life – 1992)". Discover. 14 (1): 66.
  88. ^ Mihai, Andrei (2013). "'Platypus-zilla' fossil unearthed in Australia". ZME Science. Archived from the original on 21 July 2021. Retrieved 5 November 2013.
  89. ^ Selim, Jocelyn (25 April 2005). "Sex, Ys, and Platypuses". Discover. Archived from the original on 16 May 2008. Retrieved 7 May 2008.
  90. S2CID 4379897
    .
  91. ^ "Beyond the Platypus Genome – 2008 Boden Research Conference". Reprod Fertil Dev. 21 (8): i–ix, 935–1027. 2009. Archived from the original on 21 November 2015. Retrieved 3 March 2012.
  92. S2CID 4462870
    .
  93. ^ Salleh, Anna (5 May 2014). "Platypus Sex 'Master Switch' Identified". Australian Broadcasting Corporation. Archived from the original on 6 July 2016. Retrieved 5 June 2014.
  94. PMID 33408411
    .
  95. ^ John Woinarski (Natural Resources, Environment and The Arts; Group), Andrew Burbidge (IUCN SSC Australasian Marsupial and Monotreme Specialist (22 April 2014). "IUCN Red List of Threatened Species: Ornithorhynchus anatinus". IUCN Red List of Threatened Species. Archived from the original on 4 March 2020. Retrieved 3 December 2020.
  96. ^ a b c d e f g h Hawke, Tahneal; Bino, Gilad; Kingsford., Richard T. (17 November 2020). A national assessment of the conservation status of the platypus (PDF) (Report). Archived (PDF) from the original on 24 November 2020. Retrieved 28 November 2020.
  97. ^ a b c Wilcox, Christie (29 August 2019). "The silent decline of the platypus, Australia's beloved oddity". National Geographic. Archived from the original on 12 October 2020. Retrieved 12 October 2020.
  98. ^ "EPBC Act List of Threatened Fauna". Species Profile and Threats Database. Australian Government. Department of Agriculture, Water and the Environment. Archived from the original on 5 November 2020. Retrieved 12 October 2020.
  99. EurekAlert!. Archived
    from the original on 13 May 2020. Retrieved 22 January 2020.
  100. ^ "Platypus on brink of extinction". ScienceDaily. 12 October 2020. Archived from the original on 19 October 2020. Retrieved 12 October 2020.
  101. S2CID 213833757. Archived
    from the original on 31 October 2020. Retrieved 12 October 2020 – via ScienceDirect (Elsevier).
  102. ^ Cox, Lisa (23 November 2020). "Australia's platypus habitat has shrunk 22% in 30 years, report says". the Guardian. Archived from the original on 28 November 2020. Retrieved 28 November 2020.
  103. ^ "Platypus should be listed as a threatened species: new report". UNSW Newsroom. University of New South Wales. 23 November 2020. Archived from the original on 26 November 2020. Retrieved 28 November 2020.
  104. ^ "A national assessment of the conservation status of the platypus". Australian Conservation Foundation. Archived from the original on 28 November 2020. Retrieved 28 November 2020.
  105. ^ "Platypus Fungal Disease". Department of Primary Industries and Water, Tasmania. 29 August 2008. Archived from the original on 7 March 2008. Retrieved 29 February 2008.
  106. ^ "Fantastic Fleay turns 20!". Zoos Victoria. 31 October 2013. Archived from the original on 9 November 2018. Retrieved 4 February 2014.
  107. ^ "David Fleay's achievements". Queensland Government. 23 November 2003. Archived from the original on 2 October 2006. Retrieved 13 September 2006.
  108. ^ a b "Platypus". Catalyst. 13 November 2003. Archived from the original on 23 July 2011. Retrieved 13 September 2006.
  109. ^ "Pitter patter – Platypus twins!". Zoo Victoria. 4 March 2013. Archived from the original on 28 August 2018. Retrieved 17 August 2017.
  110. ^ "Zoos". Australian Platypus Conservancy. 22 November 2016. Archived from the original on 4 March 2019. Retrieved 17 August 2017.
  111. ^ Anderson, Erik (22 November 2019). "Rare Platypus On Display At San Diego Zoo Safari Park". KPBS Public Media. Archived from the original on 13 May 2020. Retrieved 29 December 2019. The animals are the only platypuses on display outside of their native country.
  112. ^ "Platypus | San Diego Zoo Animals & Plants". animals.sandiegozoo.org. Archived from the original on 25 July 2020. Retrieved 29 December 2019.
  113. ^ "Animals: End of the Affair". Time. 19 August 1957. Archived from the original on 16 June 2007.
  114. ^ Lee S. Crandall (1964). The Management of Wild Mammals in Captivity. University of Chicago Press.
  115. ^
    ISBN 978-1563089237
    .
  116. ^ "A Brief History of the Olympic and Paralympic Mascots". Beijing2008. 5 August 2004. Archived from the original on 21 June 2008. Retrieved 25 October 2006.
  117. ^ "About World Expo '88". Foundation Expo '88. 1988. Archived from the original on 19 December 2013. Retrieved 17 December 2007.
  118. ^ "The Home of Hexley the Platypus". Archived from the original on 13 February 2011. Retrieved 25 October 2006.
  119. ^ "Circulating coins: Twenty Cents". Royal Australian Mint. 8 January 2016. Archived from the original on 19 March 2021. Retrieved 12 September 2020.
  120. ^ "Native Animals - Issue Date 13 January 2015". Australia Post Collectables. Archived from the original on 25 January 2021. Retrieved 12 September 2020.
  121. ^ "Australian Animals Monotremes – Issue Date 26 September 2016". Australia Post Collectables. Archived from the original on 26 January 2021. Retrieved 12 September 2020.
  122. ^ "Disney gives 'Ferb' pickup, major push – Q&A: Dan Povenmire". The Hollywood Reporter. 7 June 2009. Archived from the original on 20 June 2018. Retrieved 5 March 2017.
  123. ^ "Perry the Platypus" Live at Musi-Cal, archived from the original on 2 January 2021, retrieved 23 March 2021
  124. ^ Littleton, Cynthia (20 November 2009). "'Phineas' star Perry makes mark on auds". Variety. Archived from the original on 2 December 2009. Retrieved 26 November 2009.
  125. ^ Jackson, John (31 March 2009). "Five Reasons Why Phineas and Ferb is the Best Kids Show on TV". Paste. Archived from the original on 3 October 2019. Retrieved 25 November 2009.
  126. S2CID 226324381
    .

References

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External links

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