They are well adapted to their aquatic lifestyle.

Also, the first species with an adaption of both larvae and adults to the aquatic lifestyle are found.

In any case, it had many adaptations to a fully aquatic lifestyle.

While many features suggest a wholly aquatic lifestyle, Mesosaurus may have been able to move onto land for short periods of time.

It was one of the first known marine reptiles, and had many adaptations to a fully aquatic lifestyle.

Beginning in the 1970s, the effects of sauropod air sacs on their supposed aquatic lifestyle began to be explored.

River People: A hominid species adapted to an aquatic lifestyle.

These turtles have many characteristics pertaining to their aquatic lifestyle.

Adults likely had an aquatic lifestyle similar to juveniles.

Its external morphology is a sign of its aquatic and predatory lifestyle.