Facts About Axolotls

FFacts On Tap Editorial Team Fact-checked Updated December 27, 2023 3 min read

a white and black animal laying on top of rocks

Often mistaken for a water-dwelling Pokemon, the axolotl is a real amphibian and one of biology's strangest success stories. It spends its entire life underwater, keeps its feathery juvenile gills forever, and can regrow lost limbs and organs without scarring.

Native to a single lake system near Mexico City, the axolotl is now critically endangered in the wild even as it thrives in home aquariums and research labs worldwide. Here are the facts worth knowing about this remarkable creature.

Axolotls are neotenic, meaning they keep their juvenile, aquatic features for life. Unlike most salamanders, they normally never undergo metamorphosis into a land-dwelling adult form.
They can regenerate not just limbs but also parts of the heart, spinal cord, and brain, and they typically do so without scarring, which is why scientists study them so closely.
Axolotls are native to just one place on Earth: the Xochimilco lake and canal system near Mexico City. Urbanization, pollution, and invasive fish like tilapia and carp have devastated this habitat.
Wild axolotls are usually dark brown, olive, or black with speckled patterns, which helps them blend in on the lakebed.
Captive breeding has produced many color morphs, including leucistic (pale pink with dark eyes), golden and white albino (with pink or red eyes), melanoid (solid black), and axanthic (grey).
GFP axolotls carry an inserted jellyfish gene (green fluorescent protein) that makes them glow green under blue or UV light; it's a fluorescence trait layered on top of a color morph, not a color itself.
The Aztec people historically ate axolotls and also associated them with Xolotl, a god linked to fire and lightning; today they're far more likely to live in a tank than on a plate.
The feathery stalks on an axolotl's head are external gills, which it uses to pull oxygen directly from the water; it also has lungs and can gulp air at the surface.
Axolotls are carnivores that eat worms, small insects, crustaceans, and small fish in the wild, and are typically fed bloodworms, brine shrimp, and sinking pellets in captivity.
They're sensitive to water quality and do best in cool water, generally in the mid-to-upper 60s Fahrenheit (roughly 16-18 degrees C); warm water stresses them and raises the risk of illness.
Because their regenerative abilities and large, easy-to-observe embryos, axolotls are a key model species in regeneration and developmental biology research.
The IUCN Red List classifies the axolotl as Critically Endangered, with wild population estimates in Xochimilco ranging from roughly 50 to 1,000 adults.
In captivity, axolotls typically live 10 to 15 years, and some well-cared-for individuals have lived close to 20.
Axolotls can regrow a fully functional limb in a matter of weeks, a feat that has made them central to research on wound healing without scar tissue.
The name axolotl comes from Nahuatl and is often translated as 'water monster' or 'water dog.'

Frequently asked questions

What do axolotls eat in captivity?

Pet axolotls are typically fed bloodworms, brine shrimp, small pieces of fish or lean meat, and specially formulated sinking amphibian pellets. A varied, nutritionally balanced diet is important for their health.

Can axolotls live with other fish?

It's best to keep axolotls in a species-only tank. They may try to eat small fish, larger or fin-nipping fish can injure their delicate gills, and the cool water axolotls need doesn't suit most tropical fish.

How long do axolotls live?

With good care, axolotls typically live 10 to 15 years in captivity, and some have lived close to 20. Lifespan depends heavily on diet, water quality, and tank conditions.

Are axolotls endangered?

Yes. The IUCN Red List classifies axolotls as Critically Endangered. Their only wild habitat, the Xochimilco lake system, has been badly damaged by pollution, urban development, and invasive fish species.

What parts of their body can axolotls regenerate?

Axolotls can regenerate limbs, their tail, parts of the spinal cord, and portions of the heart and brain, usually without scarring. This ability makes them a major focus of regenerative medicine research.

Why are axolotls used in scientific research?

Researchers study axolotls because of their unmatched regenerative abilities and because their large, transparent embryos make early development easy to observe, offering clues that could one day inform human regenerative medicine.

Sources & further reading

Reviewed by the Facts On Tap Editorial Team

We write every article to be genuinely fun — and genuinely true. Each fact is checked against reputable sources before it goes live. Spotted something off? Tell us and read our fact-check policy.

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