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Ectothermic

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

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
Examples:
The sea turtle is ectothermic because its body temperature changes with the temperature of its surroundings.
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