chinchilla

Chinchilla Fossil range: Recent
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Chinchillidae
Genus:	Chinchilla Bennett, 1829
Species
Chinchilla lanigera Chinchilla brevicaudata
Range of Chinchilla lanigera and Chinchilla brevicaudata.      Chinchilla brevicaudata      Chinchilla lanigera

Chinchillas are crepuscular rodents, slightly larger than ground squirrels, native to the Andes mountains in South America. Along with their relatives, viscachas, they belong to the family Chinchillidae.

The animal (whose name literally means "little Chincha") is named after the Chincha people of the Andes, who once wore its soft and dense fur.^[1] By the end of the 19th century, chinchillas had become quite rare due to hunting for their fur. Most chinchillas currently used by the fur industry for clothing and other accessories are farm-raised.^[2]

Native environment

Andean Chinchilla habitat in Chile.

In their native habitat, chinchillas live in burrows or crevices in rocks. They are agile jumpers and can jump very high, up to 6 ft (1.8 m). Predators in the wild include birds of prey, skunks, felines, snakes and canines. Chinchillas have a variety of defense tactics including spraying urine and releasing fur if bitten.^[3] In the wild, chinchillas have been observed eating plants, fruits, seeds, and small insects,^[4] though this diet could irritate the digestive system of a domestic chinchilla whose diet should be primarily hay-based.^[5]

In nature, chinchillas live in social groups that resemble colonies but are properly called herds. Chinchillas can breed any time of the year. Their gestation period is 110 days, longer than most rodents. Due to this long pregnancy, chinchillas are born fully furred and with eyes open. Litters are usually small in number, predominately twins.^[6]

Chinchilla species

Comparison of Chinchilla species

There are two living species of chinchilla, Chinchilla brevicaudata and Chinchilla lanigera. There is little noticeable difference between the species except that the Chinchilla brevicaudata has a shorter tail, a thicker neck and shoulders, and shorter ears. This species is currently facing extinction.^[7] The Chinchilla lanigera species, though rare, can be found in the wild.^[4] Domestic chinchillas are thought to come from the lanigera species.^[8] The Giant Chinchilla species has been hunted to extinction.^[9]

Fur industry

Chinchilla fur coat and accessories

The international trade in chinchilla fur goes back to the 16th century. The fur from chinchillas is popular in the fur trade due to its extremely soft feel, because they have about 60 hairs sprouting from each hair follicle. The color is usually very even, which makes it ideal for small garments or the lining of large garments, though some large garments can be made entirely from the fur. A single, full-length coat made from chinchilla fur may require as many as 150 pelts, as chinchillas are relatively small.^[10] This fact led to the extinction of one species, and put serious pressure on the other two. Though wild chinchillas are no longer hunted for their fur, domestic chinchillas are still bred for this use.^[11]

Chinchillas as pets

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Domestic chinchillas can be kept as pets. Chinchillas are crepuscular, somewhat nocturnal and typically do not like to be disturbed during the day. Chinchillas are naturally very skittish creatures and generally do not like to be held, although they can become very attached to their owners. Because of their high-strung disposition, they are not usually considered to be good pets for small children. However, chinchillas can be very friendly animals if sufficiently acclimated to human touch as kits.

Captive chinchillas commonly live for 15 years, but some have been known to live up to 20 or more.^{[citation needed]} As of 2008, the world's oldest chinchilla is 27 years old and resides in the UK.^{[citation needed]}

Chinchillas make a variety of vocalizations, including chirps, squeaks, and barks. They use these sounds to locate each other and express themselves: from a calm chirp given to a potential mate; to a loud, aggressive bark when threatened. Chinchilla kits often greet their parents with a very high pitched chirp, usually to indicate that they are hungry.^{[citation needed]} The first scientific study on chinchilla sounds in their social environment was conducted by Dr. Bartl DVM in Germany.^{[12][unreliable source?]} Since they are active at night, it is not uncommon for them to vocalize in the early hours of the morning. If irritated or frightened, the female chinchillas may cluck loudly and spray urine at the offender.

Chinchillas can be housed with others of the same sex; however, it is possible that they may fight. Fighting or getting along depends on the individual animals. If the chinchillas are either introduced when young, or gradually introduced when older, conflict can be reduced. Males and females usually get along well, and may be spayed or neutered to avoid reproduction. Typical reproduction rates are two litters per year of 1–3 kits (3 being rare).

Chinchillas require extensive exercise and should have a large exercise wheel (over 15 in (380 mm) in diameter) with solid surfaces. Chinchilla legs and toes can easily get caught in a mesh running surface and tails can get caught in spokes. Chinchilla teeth need to be worn down as their teeth grow continually and can prevent the chinchilla from eating if they become overgrown.^[13] Wooden sticks, pumice stone and chew toys are good options, but conifer and citrus woods (like cedar or orange) should be avoided because of the high content of resins, oils and phenols that are toxic for chinchillas. Birch, willow, apple tree, manzanita or kiln-dried pine are all safe woods for chinchillas to chew.^[14] Chinchillas are voracious chewers and any ingested plastic can cause blockage in the intestines.

The chinchilla lacks the ability to sweat; therefore, if temperatures get above 25°C (80°F), the chinchilla could get overheated and may suffer from heat stroke. Chinchillas dissipate heat by routing blood to their large ears, so red ears signal overheating.^[15]

Active and inquisitive by nature, chinchillas need to spend some time outside of the cage to exercise and to satisfy their curiosity.

Chinchillas can be found in a variety of colors including the standard gray (the only color found in nature), beige, white, ebony, and many others.^[16] They instinctively clean their fur by taking dust baths, in which they roll around in special chinchilla dust made of fine pumice. In the wild their dust is formed from fine ground volcanic rocks. The dust gets into their fur and absorbs oil and dirt. These baths are needed a few times a week. Chinchillas do not bathe in water because the dense fur prevents air-drying, retaining moisture close to the skin, which can cause fungus growth or fur rot. A wet chinchilla must be dried immediately with towels and a no-heat hair dryer. The fur is so thick that it resists parasites such as fleas. The fur also reduces loose dander, making chinchillas hypo-allergenic.^[17]

White Mosaic Chinchilla with dark gray marking

Chinchillas eat and digest desert grasses and cannot efficiently process fatty foods, high protein foods, or too many green plants. A high quality, hay-based pellet and a constant supply of loose hay will sufficiently meet all of their dietary needs. Chinchillas have very sensitive GI tracts that can be easily disrupted so it is important to maintain them on a healthy diet.^[18] Avoid chinchilla feed that includes a mixture; chinchillas may avoid the healthy high fiber pellets in favor of items like raisins and seeds. Fresh vegetables and fruit (with high moisture content) should be avoided as these can cause bloat in a chinchilla, which can be fatal. Sweets and dried fruit treats, such as raisins should be limited to one or two per day. Chinchillas also eat and drink in very small amounts, therefore, overfeeding is easy.^[19] This can lead to diarrhea, or in the long term, diabetes. Nuts should be avoided due to their high fat content. High protein foods and hay (such as alfalfa) can cause liver problems and should be limited.^[20]

In scientific research

The chinchilla is often used as an animal model in researching the auditory system, because the chinchillas range of hearing (20 Hz to 30 kHz) and cochlear size is close to that of a human, and the chinchilla cochlea is fairly easy to access.^[21] Other research fields in which chinchillas are used as an animal model include study of Chagas disease, Gastrointestinal diseases, Pneumonia, Listeriosis, as well as of Yersinia and Pseudomonas infections.

See also

• Viscacha

References

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External links

Wikimedia Commons has media related to: Chinchillas

Wikispecies has information related to: Chinchilla

• Save the Wild Chinchillas - An organization dedicated to preserving wild chinchilla populations.
• ChinCare - Chinchilla information and rescuing.