Here are some examples of species which retain their gills into adulthood. In the salamander family Sirenidae, called sirens, external gills bunched together on their necks in their adult stage. Within the family of mole salamanders (tiger salamanders, spotted salamanders, etc.) there are sometimes neotenic individuals or populations — neotenic meaning that they never undergo full metamorphosis but reach sexual maturity as large larvae with external gills instead. One of the most famous neotenic salamanders is the axolotl — a critically endangered species within the tiger salamander complex.
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