view turtle from top |
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| navigate by keyword : 360 amphibian animal case characterized continents crocodile cryptodira developed differ divided extinct fish found freshwater frog groups head hidden including islands land dwelling living lizard major modern necked ocean order pleurodira reptile reptiles retracts ribs sea serpent shell side snake special species terrapins testudines top tortoise tortoises turtle turtles two view wildlife |
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| Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked turtles), which differ in the way the head retracts. There are 360 living and recently extinct species of turtles, including land-dwelling tortoises and freshwater terrapins. They are found on most continents, some islands and, in the case of sea turtles, much of the ocean. |
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