Which amphibian doesnt undergo metamorphosis-four-toed salemander,poison dart-frog, tree toad, or and axolotl?
“The Axolotl (or ajolote) (Ambystoma mexicanum) is the best-known of the Mexican neotenic mole salamanders belonging to the Tiger Salamander complex. Larvae of this species fail to undergo metamorphosis, so the adults remain aquatic and gilled.” http://en.wikipedia.org/wiki/Axolotl “The Axolotl is a fascinating creature for a number of reasons, including its grotesque appearance, its ability to regenerate, and primarily the fact that it exhibits the phenomenon known as neoteny. Ordinarily, amphibians undergo metamorphosis from egg to larva (the tadpole of a frog is a larva), and finally to adult form. The Axolotl, along with a number of other amphibians, remains in its larval form throughout its life. This means that it retains its gills and fins, and it doesn’t develop the protruding eyes, eyelids and characteristics of other adult salamanders.” http://www.axolotl.
