Cormorant

Cormorants and shags Temporal range: 24–0  Ma PreꞒ Ꞓ O S D C P T J K Pg N Late Oligocene - present
Little pied cormorant Microcarbo melanoleucos
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Suliformes
Family:	Phalacrocoracidae Reichenbach, 1850
Type genus
Phalacrocorax
Genera
Microcarbo Poikilocarbo Urile Phalacrocorax Gulosus Nannopterum Leucocarbo
Synonyms
Australocorax Lambrecht, 1931 Compsohalieus B. Brewer & Ridgway, 1884 Cormoranus Baillon , 1834 Dilophalieus Coues, 1903 Ecmeles Gistel, 1848 Euleucocarbo Voisin, 1973 Halietor Heine, 1860 Hydrocorax Vieillot, 1819 (non Brisson, 1760: preoccupied) Hypoleucus Reichenbach, 1852 Miocorax Lambrecht, 1933 Nesocarbo Voisin, 1973 Notocarbo Siegel-Causey, 1988 Pallasicarbo Coues, 1903 Paracorax Lambrecht, 1933 Pliocarbo Tugarinov, 1940 Stictocarbo Bonaparte, 1855 Viguacarbo Coues, 1903 Anatocarbo Nanocorax (see text)

Phalacrocoracidae is a

Cormorants and shags are medium-to-large birds, with body weight in the range of 0.35–5 kilograms (0.77–11.02 lb) and wing span of 60–100 centimetres (24–39 in). The majority of species have dark feathers. The bill is long, thin and hooked. Their feet have webbing between all four toes. All species are fish-eaters, catching the prey by diving from the surface. They are excellent divers, and under water they propel themselves with their feet with help from their wings; some cormorant species have been found to dive as deep as 45 metres (150 ft). They have relatively short wings due to their need for economical movement underwater, and consequently have among the highest flight costs of any flying bird.[3]

Cormorants nest in colonies around the shore, on trees, islets or cliffs. They are coastal rather than oceanic birds, and some have colonised inland waters. The original ancestor of cormorants seems to have been a fresh-water bird.^{[citation needed]} They range around the world, except for the central Pacific islands.

Names

"Cormorant" is a

No consistent distinction exists between cormorants and shags. The names "cormorant" and "shag" were originally the common names of the two species of the family found in Great Britain – Phalacrocorax carbo (now referred to by ornithologists as the great cormorant) and Gulosus aristotelis (the European shag). "Shag" refers to the bird's crest, which the British forms of the great cormorant lack. As other species were encountered by English-speaking sailors and explorers elsewhere in the world, some were called cormorants and some shags, sometimes depending on whether they had crests or not. Sometimes the same species is called a cormorant in one part of the world and a shag in another; for example, all species in the family which occur in New Zealand are known locally as shags, including four non-endemic species known as cormorant elsewhere in their range. Van Tets (1976) proposed to divide the family into two genera and attach the name "cormorant" to one and "shag" to the other, but this nomenclature has not been widely adopted.

Description

Cormorants and shags are medium-to-large seabirds. They range in size from the pygmy cormorant (Microcarbo pygmaeus), at as little as 45 cm (18 in) and 340 g (12 oz), to the flightless cormorant (Nannopterum harrisi), at a maximum size 100 cm (39 in) and 5 kg (11 lb). The recently extinct spectacled cormorant (Urile perspicillatus) was rather larger, at an average size of 6.3 kg (14 lb). The majority, including nearly all Northern Hemisphere species, have mainly dark plumage, but some Southern Hemisphere species are black and white, and a few (e.g. the spotted shag of New Zealand) are quite colourful. Many species have areas of coloured skin on the face (the lores and the gular skin) which can be bright blue, orange, red or yellow, typically becoming more brightly coloured in the breeding season. The bill is long, thin, and sharply hooked. Their feet have webbing between all four toes, as in their relatives.

Habitat

Habitat varies from species to species: some are restricted to seacoasts, while others occur in both coastal and inland waters to varying degrees. They range around the world, except for the central Pacific islands.

Behaviour

All cormorants and shags are fish-eaters, dining on small eels, fish, and even water snakes. They dive from the surface, though many species make a characteristic half-jump as they dive, presumably to give themselves a more streamlined entry into the water. Under water they propel themselves with their feet, though some also propel themselves with their wings (see the picture,^[4] commentary,^[5] and existing reference video^[6]). Imperial shags fitted with miniaturized video recorders have been filmed diving to depths of as much as 80 metres (260 ft) to forage on the sea floor.^[7]

After fishing, cormorants go ashore, and are frequently seen holding their wings out in the sun. All cormorants have preen gland secretions that are used ostensibly to keep the feathers waterproof. Some sources^[8] state that cormorants have waterproof feathers while others say that they have water-permeable feathers.^[9][10] Still others suggest that the outer plumage absorbs water but does not permit it to penetrate the layer of air next to the skin.^[11] The wing drying action is seen even in the flightless cormorant but not in the Antarctic shags^[12] or red-legged cormorants. Alternate functions suggested for the spread-wing posture include that it aids thermoregulation^[13] or digestion, balances the bird, or indicates presence of fish. A detailed study of the great cormorant concludes that it is without doubt^[14] to dry the plumage.^[15][16]

Cormorants are colonial nesters, using trees, rocky islets, or cliffs. The eggs are a chalky-blue colour. There is usually one brood a year. Parents regurgitate food to feed their young.

Taxonomy

This section needs to be updated. The reason given is: several paragraphs ("The cormorant family are...", "Several evolutionary groups are...", and all but the last sentence of "In recent years, three...") appear to have been written in the mid-2000s and minimally updated since then, and as such are highly outdated, requiring extensive revision to reflect a modern state of knowledge of the relationships of cormorants and their relatives. Please help update this article to reflect recent events or newly available information. (June 2023)

The genus Phalacrocorax, from which the

In recent years, three preferred treatments of the cormorant family have emerged: either to leave all living cormorants in a single genus, Phalacrocorax, or to split off a few species such as the imperial shag complex (in Leucocarbo) and perhaps the flightless cormorant. Alternatively, the genus may be disassembled altogether and in the most extreme case be reduced to the great, white-breasted and Japanese cormorants.^[19] In 2014, a landmark study proposed a 7 genera treatment, which was adopted by the IUCN Red List and BirdLife International, and later by the IOC in 2021, standardizing it.^[1][20]

The cormorants and the darters have a unique bone on the back of the top of the skull known as the os nuchale or occipital style which was called a xiphoid process in early literature. This bony projection provides anchorage for the muscles that increase the force with which the lower mandible is closed.^[21][22] This bone and the highly developed muscles over it, the M. adductor mandibulae caput nuchale, are unique to the families Phalacrocoracidae and Anhingidae.^[23][24]

Several

As per the IOU, the IUCN Red List and BirdLife International, the family contains 7 genera:^[1]

Image	Genus	Species
	Microcarbo Bonaparte, 1856	Crowned cormorant, Microcarbo coronatus Little cormorant, Microcarbo niger Little pied cormorant, Microcarbo melanoleucos Pygmy cormorant, Microcarbo pygmeus Reed cormorant or long-tailed cormorant, Microcarbo africanus †Serventys' cormorant, Microcarbo serventyorum Around Indian Ocean, one species extending from Central Asia into Europe. Mostly in freshwater habitat. Small (about 50–60 cm long), nondescript black to dark brown (except for one species with white underparts).
	Poikilocarbo Boetticher, 1935	Red-legged cormorant, Poikilocarbo gaimardi Subtropical to subantarctic Pacific South America, ranging a bit into the southwestern Atlantic. Maritime. Mid-sized (around 75 cm), grey with scalloped wings and contrasting white/yellow/red neck mark and bare parts. Its high-pitched chirping calls are quite unlike those of other cormorants.
	Urile Bonaparte, 1855	Brandt's cormorant, Urile penicillatus Red-faced cormorant, Urile urile Pelagic cormorant, Urile pelagicus Spectacled cormorant, †Urile perspicillatus Northern Pacific, one species extending into subtropical waters on the American West Coast. Maritime. Smallish to large (65–100 cm), generally black with metallic sheen (usually blue/green), in breeding plumage with bright bare facial skin in the eye region and two crests (crown and nape).
	Phalacrocorax Brisson, 1760	Bank cormorant, Phalacrocorax neglectus Socotra cormorant, Phalacrocorax nigrogularis Pitt shag, Phalacrocorax featherstoni Spotted shag, Phalacrocorax punctatus Black-faced cormorant, Phalacrocorax fuscescens Australian pied cormorant, Phalacrocorax varius Little black cormorant, Phalacrocorax sulcirostris Indian cormorant, Phalacrocorax fuscicollis Cape cormorant, Phalacrocorax capensis Japanese cormorant or Temminck's cormorant, Phalacrocorax capillatus White-breasted cormorant, Phalacrocorax lucidus Great cormorant or black shag, Phalacrocorax carbo Mostly around Indian Ocean, one species group extending throughout Eurasia and to Atlantic North America. Maritime to freshwater. Size very variable (60–100 cm), blackish with metallic sheen (usually bronze to purple) and/or white cheek and thigh patches or underside at least in breeding plumage; usually a patch of bare yellow skin at the base of the bill.
	Gulosus Montagu, 1813	European shag, Gulosus aristotelis Breeds in European Arctic, winters in Europe and North Africa. Maritime. Mid-sized (70–80 cm), glossy black, in breeding plumage with a forehead crest curled to the front.
	Nannopterum Sharpe, 1899	Flightless cormorant, Nannopterum harrisi Neotropic cormorant, Nannopterum brasilianum Double-crested cormorant, Nannopterum auritum Throughout the Americas. Mostly freshwater. Smallish to large (65–100 cm), nondescript brownish-black. One species with white tufts on sides of head in breeding plumage.
	Leucocarbo Bonaparte, 1856	Rock shag or Magellanic cormorant, Leucocarbo magellanicus Guanay cormorant, Leucocarbo bougainvillii Bounty shag, Leucocarbo ranfurlyi New Zealand king shag or rough-faced shag, Leucocarbo carunculatus Chatham shag, Leucocarbo onslowi Otago shag, Leucocarbo chalconotus Foveaux shag, Leucocarbo stewarti Auckland shag, Leucocarbo colensoi Campbell shag, Leucocarbo campbelli Imperial shag or blue-eyed shag, Leucocarbo atriceps South Georgia shag, Leucocarbo georgianus Crozet shag, Leucocarbo melanogenis Antarctic shag, Leucocarbo bransfieldensis Kerguelen shag, Leucocarbo verrucosus Heard Island shag, Leucocarbo nivalis Macquarie shag, Leucocarbo purpurascens Generally Subantarctic, but extending farther north in South America; many oceanic-island endemics. Maritime. Smallish to largish (65–80 cm), typically black above, white below, and with bare yellow or red skin in the facial region. A circumpolar group of several species (the blue-eyed shag complex) is characterised by bright blue orbital skin.

Prior to 2021, the IOU (or formerly the IOC) classified all these species in just three genera: Microcarbo, Leucocarbo, and a broad Phalacrocorax containing all remaining species; however, this treatment rendered Phalacrocorax deeply paraphyletic with respect to Leucocarbo. Other authorities, such as the Clements Checklist, formerly recognised only Microcarbo as a separate genus from Phalacrocorax.

For details, see the article "

Evolution and fossil record

The details of the evolution of the cormorants are mostly unknown. Even the technique of using the distribution and relationships of a species to figure out where it came from, biogeography, usually very informative, does not give very specific data for this probably rather ancient and widespread group. However, the closest living relatives of the cormorants and shags are the other families of the

Similarly, the origin of the family is shrouded in uncertainties. Some Late Cretaceous fossils have been proposed to belong with the Phalacrocoracidae:
A

Phylogenetic evidence indicates that the cormorants diverged from their closest relatives, the darters, during the Late Oligocene, indicating that most of the claims of Cretaceous or early Paleogene cormorant occurrences are likely misidentifications.[29]

During the late Paleogene, when the family presumably originated, much of Eurasia was covered by shallow seas, as the Indian Plate finally attached to the mainland. Lacking a detailed study, it may well be that the first "modern" cormorants were small species from eastern, south-eastern or southern Asia, possibly living in freshwater habitat, that dispersed due to tectonic events. Such a scenario would account for the present-day distribution of cormorants and shags and is not contradicted by the fossil record; as remarked above, a thorough review of the problem is not yet available.

Even when Phalacrocorax was used to unite all living species, two distinct genera of prehistoric cormorants became widely accepted today:

• Limicorallus (Indricotherium middle Oligocene of Chelkar-Teniz, Kazakhstan)
• Nectornis (Late Oligocene/Early Miocene of Central Europe – Middle Miocene of Bes-Konak, Turkey) – includes Oligocorax miocaenus

The proposed genus Oligocorax appears to be

Some other Paleogene remains are sometimes assigned to the Phalacrocoracidae, but these birds seem rather intermediate between cormorants and darters (and lack clear

• Piscator (Late Eocene of England)
• "Pelecaniformes" gen. et sp. indet. (Jebel Qatrani Early Oligocene of Fayum, Egypt) – similar to Piscator?
• Borvocarbo (Late Oligocene of C Europe)

The supposed Late Pliocene/Early Pleistocene "Valenticarbo" is a nomen dubium and given its recent age probably not a separate genus.

The remaining fossil species are not usually placed in a modern phylogenetic framework. While the numerous western US species are most likely prehistoric representatives of the coastal Urile or inland Nannopterum, the European fossils pose much more of a problem due to the singular

• Phalacrocorax marinavis (Oligocene – Early Miocene of Oregon, US) – formerly Oligocorax; Urile or Nannopterum?
• Phalacrocorax littoralis (Late Oligocene/Early Miocene of St-Gérand-le-Puy, France) – formerly Oligocorax; Nectornis?
• Phalacrocorax intermedius (Early – Middle Miocene of C Europe) – includes P. praecarbo, Ardea/P. brunhuberi and Botaurites avitus; Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax macropus (Early Miocene – Pliocene of north-west US) – Urile or Nannopterum?
• Phalacrocorax ibericus (Late Miocene of Valles de Fuentiduena, Spain) – Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax lautus (Late Miocene of Golboçica, Moldavia) – Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax serdicensis (Late Miocene of Hrabarsko, Bulgaria); Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax sp(p). (Late Miocene of Odesa region, Ukraine) – up to 4 species, one of which is probably P. longipes; Microcarbo, Phalacrocorax and/or Gulosus?[31]
• Phalacrocorax femoralis (Modelo Late Miocene/Early Pliocene of WC North America) – formerly Miocorax; Nannopterum?
• Phalacrocorax sp. (Late Miocene/Early Pliocene of Lee Creek Mine, US) – Nannopterum or Phalacrocorax?
• Phalacrocorax sp. 1 (Late Miocene/Early Pliocene of WC South America) – probably Leucocarbo
• Phalacrocorax sp. 2 (Pisco Late Miocene/Early Pliocene of SW Peru) – Poikilocarbo or Leucocarbo?
• Phalacrocorax longipes (Late Miocene – Early Pliocene of Ukraine) – formerly Pliocarbo; Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax goletensis (Early Pliocene – Early Pleistocene of Mexico) – Urile or Nannopterum, perhaps Poikilocarbo or Leuocarbo
• Phalacrocorax wetmorei (Bone Valley Early Pliocene of Florida) – Nannopterum or Phalacrocorax?
• Phalacrocorax sp. (Bone Valley Early Pliocene of Polk County, Florida, US) – Nannopterum or Phalacrocorax?^[32]
• Phalacrocorax leptopus (Juntura Early/Middle Pliocene of Juntura, Malheur County, Oregon, US) – Nannopterum?
• Phalacrocorax reliquus (Middle Pliocene of Mongolia) – Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax idahensis (Middle Pliocene – Pleistocene of Idaho, US, and possibly Florida) – Nannopterum?
• Phalacrocorax destefanii^{[verification needed]} (Late Pliocene of Italy) – formerly Paracorax; Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax filyawi (Pinecrest Late Pliocene of Florida, US) – may be P. idahensis; Nannopterum or Phalacrocorax, perhaps Urile?
• Phalacrocorax kennelli (San Diego Late Pliocene of California, US) – Urile or Nannopterum?
• Phalacrocorax kumeyaay (San Diego Late Pliocene of California, US) – Urile or Nannopterum?
• Phalacrocorax macer (Late Pliocene of Idaho, US) – Nannopterum?
• Phalacrocorax mongoliensis (Late Pliocene of W Mongolia) – Microcarbo, Phalacrocorax or Gulosus?
• Phalacrocorax sp. (La Portada Late Pliocene of N Chile) – may be same as Late Miocene/Early Pliocene "Phalacrocorax sp. 2"; Poikilocarbo or Leucocarbo?
• Phalacrocorax rogersi (Late Pliocene – Early Pleistocene of California, US) – Urile or Nannopterum?
• Phalacrocorax chapalensis (Late Pliocene/Early Pleistocene of Jalisco, Mexico) – Urile or Nannopterum, perhaps Poikilocarbo or Leucocarbo?
• Phalacrocorax gregorii (Late Pleistocene of Australia) – possibly not a valid species; Microcarbo, Phalacrocorax or Leucocarbo?
• Phalacrocorax vetustus (Late Pleistocene of Australia) – formerly Australocorax, possibly not a valid species; Microcarbo, Phalacrocorax or Leucocarbo?
• Phalacrocorax sp. (Sarasota County, Florida, US) – may be P. filawyi/idahensis; Nannopterum or Phalacrocorax?

The former "Phalacrocorax" (or "Oligocorax") mediterraneus is now considered to belong to the bathornithid Paracrax antiqua.^[33] "P." subvolans was actually a darter (Anhinga).

In human culture

Cormorant culling

This section is an excerpt from Cormorant culling.[edit]

Sea Shepherd.^[35]

Humans have used cormorants' fishing skills in various places in the world. Archaeological evidence suggests that cormorant fishing was practised in Ancient Egypt, Peru, Korea and India, but the strongest tradition has remained in China and Japan, where it reached commercial-scale level in some areas.

In a common technique, a snare is tied near the base of the bird's throat, which allows the bird only to swallow small fish. When the bird captures and tries to swallow a large fish, the fish is caught in the bird's throat. When the bird returns to the fisherman's raft, the fisherman helps the bird to remove the fish from its throat. The method is not as common today, since more efficient methods of catching fish have been developed, but is still practised as a cultural tradition.[38]^[36]

In Japan, environmental changes threaten traditional ukai because of reduced numbers of the ayu river fish that cormorants are used to catch.^[41]

In folklore, literature, and art

Cormorants feature in

In some Scandinavian areas, they are considered good omen; in particular, in Norwegian tradition spirits of those lost at sea come to visit their loved ones disguised as cormorants.[42] For example, the Norwegian municipalities of Røst, Loppa and Skjervøy have cormorants in their coat of arms. The symbolic liver bird of Liverpool is commonly thought to be a cross between an eagle and a cormorant.

In Homer's epic poem The Odyssey, Odysseus (Ulysses) is saved by a compassionate sea nymph who takes the form of a cormorant.

In 1853, a woman wearing a dress made of cormorant feathers was found on San Nicolas Island, off the southern coast of California. She had sewn the feather dress together using whale sinews. She is known as the Lone Woman of San Nicolas and was later baptised "Juana Maria" (her original name is lost). The woman had lived alone on the island for 18 years before being rescued. When removed from San Nicolas, she brought with her a green cormorant dress she made; this dress is reported to have been removed to the Vatican.^{[citation needed]} Her story, which includes the feather dress, was fictionalized in the children's novel Island of the Blue Dolphins.

The bird has inspired numerous writers, including

In the Sherlock Holmes story "The Adventure of the Veiled Lodger", Dr. Watson warns that if there are further attempts to get at and destroy his private notes regarding his time with Holmes, "the whole story concerning the politician, the lighthouse, and the trained cormorant will be given to the public. There is at least one reader who will understand."

A cormorant is humorously mentioned as having had linseed oil rubbed into it by a wayward pupil during the "Growth and Learning" segment of the 1983 Monty Python movie Monty Python's The Meaning of Life.^{[citation needed]}

The cormorant served as the hood ornament for the Packard automobile brand.^[43]

Cormorants (and books about them written by a fictional ornithologist) are a recurring fascination of the protagonist in Jesse Ball's 2018 novel Census.

The Pokémon Cramorant, featured in the 8th generation of the video game series, closely resembles a cormorant in both design and name.

The cormorant was chosen as the emblem for the Ministry of Defence Joint Services Command and Staff College at Shrivenham. A bird famed for flight, sea fishing and land nesting was felt to be particularly appropriate for a college that unified leadership training and development for the Army, Navy and Royal Air Force.^{[citation needed]}

After a member produced a mock magazine cover from a photograph of roosting cormorants, the bird became the unofficial mascot of the Pentax Discuss Mailing List with many posts dedicated to discussion of the photography of the species.^[44]

See also

• Anhinga
• Cormorant culling
• Liver bird

References

Sources

• Benson, Elizabeth (1972): The Mochica: A Culture of Peru. Praeger Press, New York.
• Berrin, Katherine & Larco Museum (1997) The Spirit of Ancient Peru: Treasures from the
  Thames and Hudson
  , New York.
• Cracraft, Joel (1971). "Systematics and evolution of the Gruiformes (Class Aves). 2. Additional comments on the Bathornithidae, with descriptions of new species" (PDF). American Museum Novitates (2449): 1–14.
• Dorst, J. & Mougin, J.L. (1979): Family Phalacrocoracidae. In: Mayr, Ernst & Cottrell, G.W. (eds.): Check-List of the Birds of the World Vol. 1, 2nd ed. (Struthioniformes, Tinamiformes, Procellariiformes, Sphenisciformes, Gaviiformes, Podicipediformes, Pelecaniformes, Ciconiiformes, Phoenicopteriformes, Falconiformes, Anseriformes): 163–179. Museum of Comparative Zoology, Cambridge.
• Hope, Sylvia (2002): The Mesozoic radiation of Neornithes. In: Chiappe, Luis M. & Witmer, Lawrence M. (eds.): Mesozoic Birds: Above the Heads of Dinosaurs: 339–388.
  ISBN 0-520-20094-2
• JSTOR 1363540
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• IUCN (2007): 2007 IUCN Red List of Threatened Species
  . IUCN, Gland.
• Kennedy, M.; Gray, R.D.; Spencer H.G. (2000). "The Phylogenetic Relationships of the Shags and Cormorants: Can Sequence Data Resolve a Disagreement between Behavior and Morphology?" (PDF). Molecular Phylogenetics and Evolution. 17 (3): 345–359.
  PMID 11133189. Archived from the original
  (PDF) on 2007-04-18.
• Kurochkin, Evgeny N. (1995). "Synopsis of Mesozoic birds and early evolution of Class Aves" (PDF). Archaeopteryx. 13: 47–66. Archived from the original (PDF) on 2007-09-27.
• Mayr, Gerald (2005). "Tertiary plotopterids (Aves, Plotopteridae) and a novel hypothesis on the phylogenetic relationships of penguins (Spheniscidae)" (PDF). Journal of Zoological Systematics. 43 (1): 67–71.
  doi:10.1111/j.1439-0469.2004.00291.x
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• Murray, Bertram G. Jr. (1970). "A Redescription of Two Pliocene Cormorants" (PDF).
  JSTOR 1366006
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• Orta, Jaume (1992): Family Phalacrocoracidae. In: del Hoyo, Josep; Elliott, Andrew & Sargatal, Jordi (eds.):
  ISBN 84-87334-10-5
• Robertson, Connie (1998): Book of Humorous Quotations. Wordsworth Editions.
  ISBN 1-85326-759-7
• Siegel-Causey, Douglas (1988). "Phylogeny of the Phalacrocoracidae" (PDF).
  JSTOR 1368846
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• Thevet, F. André (1558): About birds of Ascension Island
  . In: Les singularitez de la France Antarctique, autrement nommee Amerique, & de plusieurs terres & isles decouvertes de nostre temps: 39–40. Maurice de la Porte heirs, Paris.
• van Tets, G. F. (1976): Australasia and the origin of shags and cormorants, Phalacrocoracidae. Proceedings of the XVI International Ornithological Congress: 121–124.

External links

Wikimedia Commons has media related to Phalacrocoracidae and Phalacrocorax.

Look up cormorant in Wiktionary, the free dictionary.

• Cormorant videos on the Internet Bird Collection
• "Recovery plan for Chatham Island shag and Pitt Island shag 2001–2011" (PDF). Department of Conservation, Wellington, New Zealand. 2001. Retrieved 2007-09-28.
• First video of cormorant deep sea dive, by the Wildlife Conservation Society and the National Research Council of Argentina. WCS press release, 2012-07-31