Nick Upton / Axolotl / Mexican salamander (Ambystoma mexicanum), golden albino form, critically endangered in the wild, UK captive.

Claudio Contreras / Axolotl (Ambystoma mexicanum), captive. Critically endangered species.

Alejandro Prieto / Axolotl (Ambystoma mexicanum) swimming in a shallow stream, Manantlan reserve, Jalisco, Mexico. Critically endangered.

Alejandro Prieto / Axolotl (Ambystoma mexicanum) floating dead on surface of polluted river surrounded by litter. Axolotls are very sensitive to water contamination, they are indicators of water quality. The main threat...

Alejandro Prieto / Two Dominican nuns weighing an Axolotl (Ambystoma mexicanum). The nuns are part of the only religious organization that actively participates in conservation projects in Mexico, they help to encourage...

Alejandro Prieto / Close up of Axolotl (Ambystoma mexicanum) head and gills on white background, Mexico.

Alejandro Prieto / Glass slide showing the skeleton of an Axolotl's (Ambystoma mexicanum) hand, CINVESTAV research center, Irapuato, Mexico.

Alejandro Prieto / Axolotls (Ambystoma mexicanum), a popular pet around the world, for sale illegally, inside the black market of animals "Mercado Mixhuca" alongside other illegal species, Mexico City, Mexico.

Alejandro Prieto / Axolotls (Ambystoma mexicanum), a popular pet around the world, for sale illegally, inside the black market of animals "Mercado Mixhuca" alongside other illegal species, Mexico City, Mexico.

Alejandro Prieto / Axolotl (Ambystoma mexicanum) resting underwater next to its eggs, Sierra de Manantlan, Mexico.

Alejandro Prieto / Axototl (Ambystoma mexicanum) portrait, on white background, Mexico.

Alejandro Prieto / Axototl (Ambystoma mexicanum) swimming in pond, Mexico.