WHY do some animals grow such a fluffy tail?The tail is not horns or claws, consisting of dead cells, but quite a living part of the spinal column with dozens of vertebrae, intervertebral discs, ligaments, muscles, blood vessels.
So it is extremely sensitive, as anyone, who has ever accidentally stepped on the tail of a cat or dog, knows. And there is no way the warm-blooded people can freeze all this "stuff", otherwise it will end up in necrosis.
Thus, tail needs no less insulation than other parts of body of animal and even more,
as the tail has relatively small volume and big surface, which gives off heat. For this reason tails of animals that have to live in low temperatures are fluffy (at the same time, by the way, they serve as a warm blanket).
