The axolotl is a salamander that never fully grows up, keeping its feathery gills and aquatic lifestyle for its entire life. Its most astonishing trait is regeneration: it can regrow lost limbs, tail, heart tissue, and portions of its spinal cord and brain, perfectly and without scarring.
Because of this, axolotls are studied intensively by scientists hoping to unlock regeneration in humans. Sadly, they are critically endangered in the wild, surviving in just a few canals near Mexico City — a reminder that some of nature's most extraordinary animals are also the most fragile.
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