Axolotl

THE ANSWER
"Ambystoma mexicanum 1" — Photo by Stan Shebs / Wikimedia Commons / CC BY-SA 3.0
The creature that refuses to grow up.
Found only in a few high-altitude lakes, this oddity never undergoes metamorphosis. It prefers to remain a water-dweller for life.
Explanation
Did you know?
They are famous in scientific circles for their unparalleled ability to regrow limbs and even parts of their brain.
The 5 Clues
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“An Aztec god disguised himself as this creature to escape death.”
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“It spends its entire life in an aquatic larval state.”
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“Often smiling, it looks like a pink, feathered cartoon character.”
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“Native only to a complex system of canals near Mexico City.”
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“It is the undisputed champion of body part regeneration.”
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