An ectotherm is an animal whose body temperature is regulated by its surroundings rather than being generated internally, otherwise known as a "cold-blooded animal". To do this, ectotherms can use the heat of the sun, a heated rock, or the water it inhabits in the case of fish. The primary ectotherms include; amphibians, reptiles, fish and invertebrates. The adolescent garden snake seen hiding in the photograph is an example of an ectotherm.
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