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Like other reptiles turtles are ecotherms. They are cold-blooded and their internal temperature varies according to the ambient environment. They use their jaws to cut and chew food. Carnivorous turtles usually have knife-sharp ridges for slicing through their prey. Herbivorous turtles have serrated-edged ridges that help them cut through tough plants. Tortoises can vary in size from a few centimetres to two metres. Turtles can take many years to reach breeding age, and in many cases breed every few years rather than annually.