Unit 8.2 - Responses to the Environment

Endotherms (like humans and birds) generate heat through their metabolism to keep a constant body temperature.

For example:

shivering, changing heart rate, or storing fat.

Ectotherms (like reptiles and amphibians) depend on their environment to regulate body temperature. They don’t have internal ways to keep a constant temperature, so they might warm up in the sun or cool off in the shade.