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The axolotl is a salamander that heals without scarring. It can regrow its limbs, jaw, skin and even parts of its brain and spinal cord. The salamander can regrow a severed arm dozens of times and always makes a perfect copy. These amphibians are, according to biologist Karen Echeverri, “the superstars of regeneration."

I saw dozens of axolotls last week at �������� in Woods Hole, Mass., all of them pink and translucent. Frilly gills festoon the sides of their heads. (Native animals grow green-black skin in Mexico’s streams, where they are endangered.) The translucent animals are a microscopist’s dream. 

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