nonamniote

Example:Lizards, a type of nonamniote, are ectothermic and bask in the sun to regulate their body temperature.

Definition:An animal that obtains its primary source of heat from external sources, such as sunlight, and is unable to produce enough heat internally to maintain a constant body temperature. Nonamniotes are often ectothermic, as they do not have amniotic eggs and must rely on external conditions to maintain body temperature.

Example:Snakes are cold-blooded and, like other nonamniotes, cannot generate their body heat internally.

Definition:An animal that cannot produce its own body heat, and therefore its temperature changes with the environment. Cold-blooded animals are often nonamniotes, with the absence of amniotic eggs.