TIL that axolotl are neotenic.[0] There are rare instancea of axolotl going through metamorphosis to become terrestrial. However, if this occurs after sexual maturity the axolotl will not survive more than one or two years.[1]
[0] "axolotl ... is a neotenic salamander related to the tiger salamander." Wikipedia
[1] axolotl.org/tiger_salamander.h

Another neotenic salamander species is the Olm[0], which is an old world species that is blind and lives in caves.

[0] en.m.wikipedia.org/wiki/Olm

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