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As of 2010, wild axolotls are near extinction due to urbanization in Mexico City and polluted waters. The axolotl is only native to Lake Xochimilco and Lake Chalco in central Mexico. Unfortunately for the axolotl, Lake Chalco no longer exists as it was artificially drained to avoid periodic flooding, and Lake Xochimilco remains a diminished glimpse of its former self, existing mainly as canals. Fish such as African tilapia and Asian carp have  been introduced to the waters. These new fish have been eating the axolotls' young, as well as its primary source of food. The axolotl is currently on the International Union for Conservation of Nature's annual Red List as critically endangered in the wild,  Axolotls are used extensively in scientific research due to their ability to regenerate limbs and some body organs, even parts of their brain when damaged.  


Axolotls live at temperatures of 54 °F to 68 °F, preferably 63 °F to 64 °F. Lower temperatures result in slower metabolism; higher temperatures can lead to stress and increased appetite. Chlorine, commonly added to tapwater, is harmful to axolotls. A single typical axolotl typically requires a 40 L (11 US gal) tank with a water depth of at least 6 inches. Axolotls spend a majority of the time at the bottom of the tank.


Salts, such as Holtfreter's solution, are usually added to the water to prevent infection. 

In captivity, axolotls eat a variety of readily available foods, including trout and salmon pellets, frozen or live bloodworms, earthworms, and waxworms. Axolotls can also eat feeder fish, but care should be taken as fish left in the tank may graze on the axolotls' exposed gills. Axolotls are prone to cannibalism.

It should also be noted that Axolotls may suffer from impaction related issues if not kept on the correct substrate with fine sand being the preferred option. Impaction can be caused by the digestion of gravel and could be severe enough to cause death, therefore they must never be kept on gravel or stones that are smaller than the axolotls' head.

http://en.wikipedia.org/wiki/Axolotl
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