This is a picture of a tortoise. A tortoise is an example of an ectotherm. An ectotherm, also called a cold-blooded animal, is an animal whose body temperature depends on external sources of heat. For example, sunlight and a heated rock surface are both external sources of heat. Ectotherms include reptiles, fish, amphibians, and invertebrates. Some examples of ectotherms are tortoises, lizards, catfish, turtles, frogs, ect.
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