How Some Mammals Regulate Their Body Temperature? Can You Illustrate It By Using Examples?

In man and in the horse, the bear and the rabbit, sweat glands are distributed all over the body. Evaporation of sweat over the whole body surface greatly increases the rate of heat loss. In the dog, sweat glands are found on the paws, and wet food-prints are often seen when dogs sweat heavily. To increase the rate of heat loss the dog pants and hangs its tongue out. The evaporation of moisture on its tongue helps to cool the animal.
In the whale, which lives in cold water, fur is absent as it does not serve to reduce heat loss and is a hindrance in swimming. Instead it has a think layer of fat, the blubber, beneath its skin to serve as a heat-insulating layer. When the whale is very active considerable heat is produced and much of it is lost during respiration.
Small mammals e.g. mice have a very large surface area compared to their volume, so it is difficult to prevent heat loss. This is one reason for the high metabolic rate in these mammals. They also need a high food intake to provide sufficient energy for the maintenance of body temperature. Many small mammals are able to avoid temperature extremes by living in burrows, shelters etc.