Which one of the following animals is not 'warm-blooded'?

Warm-blooded animals (homeothermic/endothermic) can internally maintain a constant body temperature regardless of ambient environmental shifts. This category encompasses all birds (e.g., Hen) and mammals (e.g., Tiger, Bat).
Cold-blooded animals (poikilothermic/ectothermic) cannot regulate their internal body temperature and rely on external heat sources. This includes amphibians (e.g., Toad), reptiles, and fish.