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Wonders of the real world

Wonders of axolotls

The axolotl (Ambystoma mexicanum)

What makes an axolotl an axolotl

The axolotl is a type of salamander from Mexico. Here are three things worth knowing about it.

Young all its life

Unlike other salamanders, axolotls keep their young features when they grow up. They stay in the water all their lives, with feathery gills on the outside, a tail and a body fin.

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A water dog

The word "axolotl" comes from Nahuatl, the language of the Aztecs, and means "water dog". It is also called the Mexican walking fish, though it is not a fish at all.

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Lake dwellers

In the wild, axolotls are found only in Mexico City, in still-water lakes such as Lake Xochimilco.

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Amazing regrowth

The salamander that grows back

Axolotls have an incredible ability. They can regrow their legs, lungs, heart, jaws, spines and even parts of their brain. Scientists have found that an axolotl can regrow a new leg five times perfectly, in a few weeks, without even a scar. Every kind of tissue is replaced: skin, bone, cartilage, muscle and stem cells. Other body parts can grow back again and again and still work completely. Scientists would like to understand how axolotls do this, and to find out whether it could one day help people heal too.

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Night hunter

Life on the lake bottom

Axolotls are naturally dark, to match their muddy lake homes, and they can turn a few shades lighter or darker to stay hidden. During the day, they burrow into water plants and mud. At night, they become lively and hungry. An axolotl feeds by suction, sucking in worms, tadpoles, insects and small fish. Sometimes gravel gets sucked in too, which helps grind up food in its stomach. Now and then, they may pop up to the surface for a quick gulp of air.

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Three remarkable salamanders

Olm

Proteus

Olms are salamanders that live in the water of caves in the Dinaric Alps of Europe. Their skin is yellowish-white or pink, and their eyes are covered by a layer of skin. Experiments have shown that an olm can survive up to 10 years without food.

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Japanese giant salamander

Andrias japonicus

Found only in Japan, it can grow to a length of up to 1.5 metres. It lives in streams with clear, cool water, and it takes in oxygen through its skin, which has many folds. A male, called a den master, guards the eggs and fans water over them with his tail.

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Fire salamander

Salamandra salamandra

A common salamander of Europe, it is black with yellow spots or stripes. Its bright colouring warns predators that it is toxic. In some subspecies, the young develop inside the mother until she gives birth to fully formed little salamanders.

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