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==Introduction==

==Introduction==

The chinchilla is a type of hystricomorph rodent and there are two types; the ''Chinchilla langier'', or long-tail and the ''Chinchilla chinchilla'' which has a short tail. Chinchilla are found in the wild at altitudes of between 9,000-12,000 ft within the Andes in South America. Chinchilla have been kept in captivity since 1923 when a small number of animals were brought to North America.  

The chinchilla is a type of hystricomorph rodent of which there are two types; the ''Chinchilla langier'', or long-tail and the ''Chinchilla chinchilla'' which has a short tail. Chinchilla are found in the wild at altitudes of between 9,000-12,000 ft within the Andes in South America. Chinchilla have been kept in captivity since 1923 when a small number of animals were brought to North America.  

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Chinchillas are used in laboratory experiments for a number of reasons but a common reason is that the chinchilla has a hearing range that is closest to that of humans. Therefore many experiments researching the auditory system utilise chinchillas. Research using chinchillas has been undertaken since the 1970s. Chinchillas also make good laboratory animals as they are relatively easy to maintain, have long life spans of up to 20 years and can also be trained in basic techniques to facilitate easier laboratory techniques. Further to this viral and bacterial infections are relatively uncommon as are tumours.

Chinchillas are used in laboratory experiments for a number of reasons but a common reason is that the chinchilla has a hearing range that is closest to that of humans. Therefore many experiments researching the auditory system utilise chinchillas. Research using chinchillas has been undertaken since the 1970s. Chinchillas also make good laboratory animals as they are relatively easy to maintain, have long life spans (up to 20 years) and can also be trained in basic techniques to facilitate easier laboratory handling. Further to this, viral and bacterial infections are relatively uncommon, as are tumours.

==Physiology==

==Physiology==