Ectotherm

Definition

An animal that regulates its body temperature primarily through behavioral means, such as basking in the sun or seeking shade.

Etymology

From Greek 'ecto-', meaning 'outside', and 'thermon', meaning 'heat'.

Example

Many reptiles are ectotherms, relying on the sun to warm their bodies.

Related Terms

• Thermoregulation
• Cold-blooded
• Poikilothermic

Usage Notes

Ectotherms typically have a lower metabolic rate compared to endotherms.