Neoteny refers to animals that retains juvenile features even when they become adults. The most well-known example is the axolotl, a type of salamander that remains tadpole-like all its life, never losing its gills and never leaving the water to live on land. Neoteny is an important feature in evolution: human beings are neotenous primates and insects might be descended from a neotenous millipede-like ancestor.
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