Rat

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For other uses, see Rat (disambiguation).
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Rats
Brown rat (Rattus norvegicus)
Brown rat (Rattus norvegicus)
Scientific classificationEdit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Mirorder: Simplicidentata
Order: Rodentia

Rats are various medium-sized, long-tailed

Dipodomys
(kangaroo rats).

Rats are typically distinguished from

muroid rodent will include the word "rat", while a smaller muroid's name will include "mouse". The common terms rat and mouse are not taxonomically specific. There are 56 known species of rats in the world.[1]

Species and description

A rat in a suburb of Vancouver
Skeleton of a black rat (Rattus rattus) on display at the Museum of Osteology.

The best-known rat species are the black rat (Rattus rattus) and the brown rat (Rattus norvegicus). This group, generally known as the Old World rats or true rats, originated in Asia. Rats are bigger than most Old World mice, which are their relatives, but seldom weigh over 500 grams (17+1⁄2 oz) in the wild.[2]

The term rat is also used in the names of other small

murine rodents related to true rats but are not members of the genus Rattus.[4][5]

Male rats are called bucks; unmated females, does, pregnant or parent females, dams; and infants, kittens or pups. A group of rats is referred to as a mischief.[6]

The common species are opportunistic survivors and often live with and near

island endemics, some of which have become endangered due to habitat loss or competition with the brown, black, or Polynesian rat.[8]

Wild rodents, including rats, can carry many different

Xenopsylla cheopis), which preyed on black rats living in European cities during the epidemic outbreaks of the Middle Ages; these rats were used as transport hosts. Another zoonotic disease linked to the rat is foot-and-mouth disease.[10]

Rats become sexually mature at age 6 weeks, but reach social maturity at about 5 to 6 months of age. The average lifespan of rats varies by species, but many only live about a year due to predation.[11]

The black and brown rats diverged from other Old World rats in the forests of Asia during the beginning of the Pleistocene.[12]

Rat tails

A closeup of a rat tail

The characteristic long tail of most rodents is a feature that has been extensively studied in various rat species models, which suggest three primary functions of this structure:

pathologies that have been the subject of investigation.[citation needed
]

Microscopic cross section of Rattus rattus tail, delineating tendon bundles, vasculature, and vertebral canal.

Multiple studies have explored the thermoregulatory capacity of rodent tails by subjecting test organisms to varying levels of physical activity and quantifying

heat dissipation from a rat's tail relative to its abdomen.[16] This observation was attributed to the higher proportion of vascularity in the tail, as well as its higher surface-area-to-volume ratio, which directly relates to heat's ability to dissipate via the skin. These findings were confirmed in a separate study analyzing the relationships of heat storage and mechanical efficiency in rodents that exercise in warm environments. In this study, the tail was a focal point in measuring heat accumulation and modulation.[citation needed
]

On the other hand, the tail's ability to function as a proprioceptive sensor and modulator has also been investigated. As aforementioned, the tail demonstrates a high degree of muscularization and subsequent

flexion and extension of tail muscles to produce slight shifts in the organism's center of mass, orientation, etc., which ultimately assists it with achieving a state of proprioceptive balance in its environment. Further mechanobiological investigations of the constituent tendons in the tail of the rat have identified multiple factors that influence how the organism navigates its environment with this structure. A particular example is that of a study in which the morphology of these tendons is explicated in detail.[18] Namely, cell viability tests of tendons of the rat's tail demonstrate a higher proportion of living fibroblasts that produce the collagen for these fibers. As in humans, these tendons contain a high density of golgi tendon organs that help the animal assess stretching of muscle in situ and adjust accordingly by relaying the information to higher cortical areas associated with balance, proprioception, and movement.[citation needed
]

The characteristic tail of murids also displays a unique defense mechanism known as

acute pain, such as when a predator snatches the organism by the tail.[citation needed
]

As pets

Main article: Fancy rat
domesticated
rat

Specially bred rats have been kept as pets at least since the late 19th century. Pet rats are typically variants of the species

zoonotic diseases than pets such as cats or dogs.[21]
Tamed rats are generally friendly and can be taught to perform selected behaviors.

Selective breeding has brought about different color and marking varieties in rats. Genetic mutations have also created different fur types, such as rex and hairless. Congenital malformation in selective breeding have created the dumbo rat, a popular pet choice due to their low, saucer-shaped ears.[22] A breeding standard exists for rat fanciers wishing to breed and show their rat at a rat show.[23]

As subjects for scientific research

Main article: Laboratory rat
diabetes, a metabolic disorder
also found among humans.

In 1895,

albino brown rats to study the effects of diet and for other physiological studies.[24] Over the years, rats have been used in many experimental studies, adding to our understanding of genetics, diseases, the effects of drugs, and other topics that have provided a great benefit for the health and wellbeing of humankind.[25]

The

pulmonary arteries and double or absent aortic arches.[27] Despite existing anatomical analogy in the inthrathoracic position of the heart itself, the murine model of the heart and its structures remains a valuable tool for studies of human cardiovascular conditions.[28]

The rat's larynx has been used in experimentations that involve inhalation toxicity, allograft rejection, and irradiation responses. One experiment described four features of the rat's larynx. The first being the location and attachments of the thyroarytenoid muscle, the alar cricoarytenoid muscle, and the superior cricoarytenoid muscle, the other of the newly named muscle that ran from the arytenoid to a midline tubercle on the cricoid. The newly named muscles were not seen in the human larynx. In addition, the location and configuration of the laryngeal alar cartilage was described. The second feature was that the way the newly named muscles appear to be familiar to those in the human larynx. The third feature was that a clear understanding of how MEPs are distributed in each of the laryngeal muscles was helpful in understanding the effects of botulinum toxin injection. The MEPs in the posterior cricoarytenoid muscle, lateral cricoarytenoid muscle, cricothyroid muscle, and superior cricoarytenoid muscle were focused mostly at the midbelly. In addition, the medial thyroarytenoid muscle were focused at the midbelly while the lateral thyroarytenoid muscle MEPs were focused at the anterior third of the belly. The fourth and final feature that was cleared up was how the MEPs were distributed in the thyroarytenoid muscle.[29]

Laboratory rats have also proved valuable in psychological studies of learning and other mental processes (Barnett 2002), as well as to understand

primates.[32][33]

Domestic rats differ from wild rats in many ways. They are calmer and less likely to bite; they can tolerate greater crowding; they breed earlier and produce more offspring; and their brains, livers, kidneys, adrenal glands, and hearts are smaller (Barnett 2002).

aggressiveness, and adaptability. Their psychology seems in many ways similar to that of humans.[35]

Entirely new

Wistar rat, have been bred for use in laboratories. Much of the genome of Rattus norvegicus has been sequenced.[36]

General intelligence

Early studies found evidence both for and against measurable intelligence using the "g factor" in rats.[37][38] Part of the difficulty of understanding animal cognition, generally, is determining what to measure.[39] One aspect of intelligence is the ability to learn, which can be measured using a maze like the T-maze.[39] Experiments done in the 1920s showed that some rats performed better than others in maze tests, and if these rats were selectively bred, their offspring also performed better, suggesting that in rats an ability to learn was heritable in some way.[39]

As food

Main article: Rat meat

Rat meat is a food that, while

taboo in some cultures, is a dietary staple in others.[40]

Working rats

Main article: Working rat

Rats have been used as working animals. Tasks for working rats include the sniffing of gunpowder residue,

landmines and diagnose tuberculosis through smell.[41]

As pests

Rodent Bait Station, Chennai, India

Rats have long been considered deadly pests. Once considered a modern myth, the

Centers for Disease Control does list nearly a dozen diseases[45]
directly linked to rats.

Most urban areas battle rat infestations. A 2015 study by the

rat catcher.[48]

Chicago was declared the "rattiest city" in the US by the pest control company Orkin in 2020, for the sixth consecutive time. It's followed by Los Angeles, New York, Washington, DC, and San Francisco.[49] To help combat the problem, a Chicago animal shelter has placed more than 1000 feral cats (sterilized and vaccinated) outside of homes and businesses since 2012, where they hunt and catch rats while also providing a deterrent simply by their presence.[50]

Rats have the ability to swim up sewer pipes into toilets.[51][52] Rats will infest any area that provides shelter and easy access to sources of food and water, including under sinks, near garbage, and inside walls or cabinets.[53]

In the spread of disease

Rats can serve as

SARS-CoV-2 lineages, due to unknown viral RNA fragments in sewage matching mutations previously shown to make SARS-CoV-2 more adept at rodent-based transmission.[55]

Rats are also associated with human

rat mite dermatitis.[57]

As invasive species

Rat-catching, 1823, by Edwin Landseer, engraving, published by Hurst, Robinson & Co.

When introduced into locations where rats previously did not exist, they can wreak an enormous degree of

Rattus norvegicus, the brown rat or wharf rat, has also been carried worldwide by ships in recent centuries.[60]

The ship or wharf rat has contributed to the extinction of many species of wildlife, including birds, small mammals, reptiles, invertebrates, and plants, especially on islands. True rats are omnivorous, capable of eating a wide range of plant and animal foods, and have a very high birth rate. When introduced to a new area, they quickly reproduce to take advantage of the new food supply. In particular, they prey on the eggs and young of forest birds, which on isolated islands often have no other predators and thus have no fear of predators.[61] Some experts believe that rats are to blame for between forty percent and sixty percent of all seabird and reptile extinctions, with ninety percent of those occurring on islands. Thus man has indirectly caused the extinction of many species by accidentally introducing rats to new areas.[62]

Rat-free areas

Rat trapped in a cage

Rats are found in nearly all areas of Earth which are inhabited by human beings. The only rat-free continent is

South Georgia Island), where breeding seabirds could be badly affected if rats were introduced, is subject to special measures and regularly monitored for rat invasions.[63]

As part of

Hawadax Island, Alaska was declared rat free after 229 years[64] and Campbell Island, New Zealand after almost 200 years.[65][66] Breaksea Island in New Zealand was declared rat free in 1988 after an eradication campaign based on a successful trial on the smaller Hawea Island nearby.[67][68]

In January 2015, an international "Rat Team" set sail from the

British Overseas Territory of South Georgia and the South Sandwich Islands on board a ship carrying three helicopters and 100 tons of rat poison with the objective of "reclaiming the island for its seabirds". Rats have wiped out more than 90% of the seabirds on South Georgia, and the sponsors hope that once the rats are gone, it will regain its former status as home to the greatest concentration of seabirds in the world. The South Georgia Heritage Trust, which organized the mission describes it as "five times larger than any other rodent eradication attempted worldwide".[69]
That would be true if it were not for the rat control program in Alberta (see below).

The Canadian province of Alberta is notable for being the largest inhabited area on Earth which is free of true rats due to very aggressive government rat control policies. It has large numbers of native pack rats, also called bushy-tailed wood rats, but they are forest-dwelling vegetarians which are much less destructive than true rats.[70]

Alberta was settled relatively late in North American history and only became a province in 1905. Black rats cannot survive in its climate at all, and brown rats must live near people and in their structures to survive the winters. There are numerous predators in Canada's vast natural areas which will eat non-native rats, so it took until 1950 for invading rats to make their way over land from Eastern Canada.[71] Immediately upon their arrival at the eastern border with Saskatchewan, the Alberta government implemented an extremely aggressive rat control program to stop them from advancing further. A systematic detection and eradication system was used throughout a control zone about 600 kilometres (400 mi) long and 30 kilometres (20 mi) wide along the eastern border to eliminate rat infestations before the rats could spread further into the province. Shotguns, bulldozers, high explosives, poison gas, and incendiaries were used to destroy rats. Numerous farm buildings were destroyed in the process. Initially, tons of arsenic trioxide were spread around thousands of farm yards to poison rats, but soon after the program commenced the rodenticide and medical drug warfarin was introduced, which is much safer for people and more effective at killing rats than arsenic.[72]

Forceful government control measures, strong public support and enthusiastic citizen participation continue to keep rat infestations to a minimum.[73] The effectiveness has been aided by a similar but newer program in Saskatchewan which prevents rats from even reaching the Alberta border. Alberta still employs an armed rat patrol to control rats along Alberta's borders. About ten single rats are found and killed per year, and occasionally a large localized infestation has to be dug out with heavy machinery, but the number of permanent rat infestations is zero.[74]

In culture

Ancient Romans did not generally differentiate between rats and mice, instead referring to the former as mus maximus (big mouse) and the latter as mus minimus (little mouse).[75]

On the Isle of Man, there is a taboo against the word "rat".[76]

Chinese zodiac pendant with 5 rats climbing ruyi, bat at top of pendant

Asian cultures

Main article: Rat (zodiac)
Two mice, Vietnam Museum of Ethnology - Hanoi
Chuột rước đèn (The mouse carries the lamp), Vietnamese Đông Hồ painting

The rat (sometimes referred to as a mouse) is the first of the twelve animals of the Chinese zodiac. People born in this year are expected to possess qualities associated with rats, including creativity, intelligence, honesty, generosity, ambition, a quick temper and wastefulness. People born in a year of the rat are said to get along well with "monkeys" and "dragons", and to get along poorly with "horses".

Indigenous rats are allowed to run freely throughout the Karni Mata Temple.

In Indian tradition, rats are seen as the vehicle of

Hindu
holy men). The attending priests feed milk and grain to the rats, of which the pilgrims also partake.

European cultures

European associations with the rat are generally negative. For instance, "Rats!" is used as a substitute for various vulgar

fleas) with the 14th-century medieval plague called the Black Death. Rats are seen as vicious, unclean, parasitic animals that steal food and spread disease. In 1522, the rats in Autun, France were charged and put on trial for destroying crops.[77] However, some people in European cultures keep rats as pets
and conversely find them to be tame, clean, intelligent, and playful.

Rats are often used in scientific experiments; animal rights activists allege the treatment of rats in this context is cruel. The term "lab rat" is used, typically in a self-effacing manner, to describe a person whose job function requires them to spend a majority of their work time engaged in bench-level research (such as postgraduate students in the sciences).

Terminology

Rats are frequently blamed for damaging food supplies and other goods, or spreading disease. Their reputation has carried into common parlance: in the

state's evidence. Writer/director Preston Sturges created the humorous alias "Ratskywatsky" for a soldier who seduced, impregnated, and abandoned the heroine of his 1944 film, The Miracle of Morgan's Creek. It is a term (noun and verb) in criminal slang for an informant – "to rat on someone" is to betray them by informing the authorities of a crime
or misdeed they committed. Describing a person as "rat-like" usually implies he or she is unattractive and suspicious.

Among trade unions, the word "rat" is also a term for nonunion employers or breakers of union contracts, and this is why unions use inflatable rats.[78]

Fiction

See also: Fancy rat § Fiction
Imperial Japan depicted as a rat in a World War II
United States Navy propaganda poster.

Depictions of rats in fiction are historically inaccurate and negative. The most common falsehood is the squeaking almost always heard in otherwise realistic portrayals (i.e. non

anthropomorphic
). While the recordings may be of actual squeaking rats, the noise is uncommon – they may do so only if distressed, hurt, or annoyed. Normal vocalizations are very high-pitched, well outside the range of human hearing. Rats are also often cast in vicious and aggressive roles when in fact, their shyness helps keep them undiscovered for so long in an infested home.

The actual portrayals of rats vary from negative to positive with a majority in the negative and ambiguous.

Room 101 in George Orwell's Nineteen Eighty-Four or The Pit and the Pendulum by Edgar Allan Poe
.

Selfish helpfulness —those willing to help for a price— has also been attributed to fictional rats.[79] Templeton, from E. B. White's Charlotte's Web, repeatedly reminds the other characters that he is only involved because it means more food for him, and the cellar-rat of John Masefield's The Midnight Folk requires bribery to be of any assistance.

By contrast, the rats appearing in the Doctor Dolittle books tend to be highly positive and likeable characters, many of whom tell their remarkable life stories in the Mouse and Rat Club established by the animal-loving doctor.

Some fictional works use rats as the main characters. Notable examples include the society created by O'Brien's

Doctor Rat, and Rizzo the Rat from The Muppets. Pixar's 2007 animated film Ratatouille is about a rat described by Roger Ebert as "earnest... lovable, determined, [and] gifted" who lives with a Parisian garbage-boy-turned-chef.[80]

Mon oncle d'Amérique ("My American Uncle"), a 1980 French film, illustrates Henri Laborit's theories on evolutionary psychology and human behaviors
by using short sequences in the storyline showing lab rat experiments.

In

novels written by Harry Harrison
.

Wererats,

role playing games like Dungeons & Dragons[81][82][83] and fantasy fiction like the Anita Blake series.[84]

The Pied Piper

Main article: Pied Piper of Hamelin

One of the oldest and most historic stories about rats is "

The Amazing Maurice and his Educated Rodents, and Belgian graphic novel Le Bal du Rat Mort (The Ball of the Dead Rat). Furthermore, a linguistic phenomenon when a wh-expression drags with it an entire encompassing phrase to the front of the clause has been named pied-piping after "Pied Piper of Hamlin" (see also pied-piping with inversion
).

See also

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Further reading

External links

Look up rat in Wiktionary, the free dictionary.
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