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Hawksbill Turtle (Eretmochelys imbricata) swimming above coral reef, underwater view
Paul Souders/Digital Vision/Getty Images

An ectothermic animal is one who cannot regulate its own body temperature, so its body temperature fluctuates according to its surroundings.

Ectothermic animals, or ectotherms, are commonly referred to as "cold-blooded." Examples of ectotherms are: reptiles, amphibians, and fish.

The opposite of an ectotherm is an endotherm.

Also Known As: Cold-blooded
The sea turtle is ectothermic because its body temperature changes with the temperature of its surroundings.
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