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More About Tortoises ...
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Tortoise is the name given to the land-dwelling reptiles most of whose body is shielded by a special shell. Turtles and terrapins are the marine species. All living tortoises are members of the order Testudines.
Tortoises have both an endoskeleton and an exoskeleton. All Tortoises have a protective shell around their bodies. The top part of their case is called the carapace, the underside is the plastron, and the two are connected by the bridge.
The size of tortoises can vary from a few centimetres to up to two meters. Tortoises generally live a long time, some individuals being known to have lived longer than 150 years.
The giant tortoises of the Galapagos Islands helped Charles Darwin formulate his theory of evolution, since the isolated populations on the different islands, although descended from a common ancestor, had diverged to different forms. One of Darwin's tortoises, named Harriet is believed to still be alive and living in an Australian zoo.
All land tortoises are herbivorous in the wild.
The first turtles already existed in the era of the dinosaurs, some 200 million years ago. Turtles and tortoises are the only surviving branch of the even more ancient clade Anapsida, which includes groups such as the procolophonoids, millerettids and pareiasaurs. Most of the anapsids became extinct in the late Permian period, with the exception of the procolophonoids and the precursors of the testudines (turtles and tortoises).
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Source: Wikipedia Read more about Tortoises
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