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Sea turtles, sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback, green, hawksbill, leatherback, loggerhead, Kemp's ridley, and olive ridley.
Tortoises are reptiles of the family Testudinidae of the order Testudines. Like other testudines, tortoises have a shell to protect from predation and other threats.
The pond slider is a species of common, medium-sized, semiaquatic turtle. Three subspecies are described, the most recognizable of which is the red-eared slider, which is popular in the pet trade and has been introduced to other parts of the world by people releasing it to the wild.