Jane Burton / Axolotl {Siredon / Ambystoma mexicanum} albino, captive.

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

Stephen Dalton / Mexican axolotl {Ambystoma mexicanum} albino, controlled conditions

Stephen Dalton / Mexican axolotl (Ambystoma mexicanus) albino, portrait, controlled conditions

Nature Production / Mexico Salamander / Axolotl {Ambystoma mexicanum} captive

Ingo Arndt / Mexican Axolotl (Ambystoma mexicanum), native to North America

Ingo Arndt / Mexican Axolotl (Ambystoma mexicanum), native to North America

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.

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), melanistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), melanistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), melanistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

Chris Mattison / Axolotl (Ambystoma mexicanum) against white background. Captive. Endemic to Central America.

Pete Oxford / Mexican axolotl (Ambystoma mexicanum) Albino, captive, Critically endangered

Pete Oxford / Larva of the Mexican axolotl (Ambystoma mexicanum) swimming, captive, critically endangered

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) neotenic adult, native to Mexico

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) neotenic adult, native to Mexico

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) neotenic adult, native to Mexico

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) larva on day seventeen of development, native to Mexico, sequence 13/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) leucistic neotenic sub-adult, native to Mexico

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) larva on day fourteen of development, native to Mexico, sequence 12/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day nine of development, native to Mexico, sequence 6/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day seven of development, native to Mexico, sequence 5/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day six of development, native to Mexico, sequence 4/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day five of development, native to Mexico, sequence 3/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day thirteen of development, native to Mexico, sequence 11/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day twelve of development, native to Mexico, sequence 10/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day eleven of development, native to Mexico, sequence 9/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day eleven of development, native to Mexico, sequence 8/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) egg on day ten of development, native to Mexico, sequence 7/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) eggs on day one of development, native to Mexico, sequence 2/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) eggs on day one of development, native to Mexico, sequence 1/13

Stephen Dalton / Mexican axolotyl {Ambystoma mexicanum} albino, swimming underwater, controlled conditions

Stephen Dalton / Mexican axolotyl {Ambystoma mexicanum} albino, underwater, controlled conditions

Stephen Dalton / Mexican axolotl (Ambystoma mexicanus) albino, portrait, controlled conditions

Nick Barwick / Axolotl showing gills, kept as pet (Ambystoma mexicanum) captive

Tony Phelps / Axolotl {Ambystoma mexicanum} captive.

Kim Taylor / Axolotl egg about to hatch {Ambystoma mexicanum}

Jane Burton / Axolotl {Siredon / Ambystoma mexicanum} albino. UK, captive. *NOT AVAILABLE for use on travel and tourism advertising (all media) until September 2012*

Nick Barwick / Axolotl (Ambystoma mexicanum) showing gills, captive, kept as pet, critically endangered

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.

Alejandro Prieto / Axolotl (Ambystoma mexicanum) swimming in a small pool surrounded by trees, Sierra de Manantlan, Mexico.

Alejandro Prieto / Axolotl (Ambystoma mexicanum) underwater surrounded by lush aquatic vegetation, Mexico.

Alejandro Prieto / A young Axolotl ( (Ambystoma mexicanum) without limbs, with the leg of an adult in the foreground, on white background, Mexico.

Alejandro Prieto / Microscope image of a newborn Axolotl (Ambystoma mexicanum) showing external gills, tail and two projections on both sides of the head, Mexico.

Alejandro Prieto / Gills of a juvenile Axolotl (Ambystoma mexicanum) seen through the microscope, CINVESTAV research center, Irapuato, Mexico.

Alejandro Prieto / Silhouette of Axolotl (Ambystoma mexicanum) swimming in a woodland stream surrounded by towering trees, Sierra de Manantlan, Mexico.

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

Alejandro Prieto / Axolotls (Ambystoma mexicanum) in containers of water after being caught from the wild by scientists studying them, Sierra de Manantlan, Mexico.

Alejandro Prieto / Axolotl (Ambystoma mexicanum) caught by scientists in trap made of fine cloth, Sierra de Manantlan, Mexico.

John Cancalosi / Axolotl (Ambystoma mexicanum) captive, occurs in Mexico. Critically endangered, endemic species.

John Cancalosi / Axolotl (Ambystoma mexicanum), white or leucistic form, neotenic salamander. Captive, critically endangered in the wild, occurs in Mexico.

John Cancalosi / Axolotl (Ambystoma mexicanum), white or leucistic form, neotenic salamander. Captive, critically endangered in the wild, occurs in Mexico.

John Cancalosi / Axolotl (Ambystoma mexicanum), white or leucistic form, neotenic salamander. Captive, critically endangered in the wild, occurs in Mexico.

Sylvain Cordier / Axolotl (Ambystoma mexicanum) portrait, captive, endemic to Mexico.