Question

Select all that apply.

Which vertebrates are endothermic?

birds
reptiles
amphibians
mammals
bony fish

Answer 1

birds and animals and maybe the bony fish.

Answer 2

The correct answer - birds, mammals and bony fish.

Birds, mammals and some fish such as bony fish are the groups of endothermic animals. Endothermic animals are warm-blooded animals. Animals of these groups always maintain constant body temperature, irrespective of change in the environment. Whereas, reptiles, amphibians and other fish are cold blooded or ectothermic or poikilothermic animals. They cannot regulate body temperature at constant level. Their body temperature depends on the external temperature.