The right option is; birds and mammals
Endotherms are animals that can generate and maintain a constant body temperature (heat) irrespective of their environmental temperature. The endotherms mainly include birds and mammals. If the heat generated by endotherms is more than the heat loss, they usually sweats or pants to maximize the heat loss, but if the heat loss is more than the heat generated the metabolic rate is increased or they shiver to increase their body temperature.
