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Axolotl

Range:

Only in Lake Zochimilco, Mexico


Habitat:

In nature, the axolotl is found only in an aquatic or damp land environment in and around clean, cold snowfed lakes.


Characteristics:

They have cylindrical bodies, short legs and a relatively long tail. An albino variety has been produced in captivity; the natural coloration is dark. They have movable eyelids (in the adult form); 4 fingers and 5 toes; vertical rib grooves along the side of the body.


Axolotl Click to View Bigger Picture

Behavior:

The axolotl will stay in its larval form, retaining features such as gills, all of its life into adulthood. These larval form adults are termed paedomorphic. Should the axolotl undergo metamorphosis (triggered by the drying up of pools), it is transformed into the Mexican salamander. Somehow the young xochimilco environment favors paedomorphosis, perhaps due to an insufficient quantity of iodine in the water, which is necessary to produce the hormone thyroxine. (Thyroxine is produced in the animal\\\\\\\'s pituitary. The tissues are sensitive to this, thereby triggering metamorphosis). Or it may be due to cold lake temperatures in which thyroxine has little effect.


Reproduction:

The axolotl is an extreme example of neoteny, meaning that it becomes sexually mature and is able to reproduce in its aquatic larval form. They become sexually mature at 1 1/2 years. The characteristic sperm packets produced by the male are caught by the female, who will produce 200-600 eggs. Fertilization is internal. Incubation takes 2-3 weeks.


Interesting Facts:

The name "axolotl" stems from an Aztec word meaning water monster. They are sold as food in the markets of Mexico and resemble eel in taste.


Axolotl Click to View Bigger Picture

Did YOU Know?
In the wild they are critically endangered due to habitat destruction.

Axolotl
Range
Class: amphibian
Order: Caudata
Family: Ambystomatidae
Genus: Ambystoma
Species: mexicanum
Length: 30 centimeters (12 inches)
Length: 30 centimeters (12 inches)
Wild Diet: While still young they fed on plankton and algae. As adults they are carnivorous, feeding on aquatic insects
Predators: Predatory birds such as herons
Where at the Zoo? Small Animal Building


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