This is the case with most birds and mammals and many races of man.
Only the birds and mammals have warm blood, and of these the birds are distinctly the warmer.
In the case of mammals the covering is fur, in the case of birds feathers.
His tusks are his incisors, and they have developed as have almost no other teeth in the mammals.
The leader of the mammals turned and faced the earth people.
But such a notion is preposterous with respect to all, but evidently so with mammals.
They combine all the best features of plants, reptiles, and mammals.
That is to say, mammals, like the reptiles before them, conquer every haunt of life.
From the terrestrial Dinosaurs it seems that Birds and Mammals arose.
Of all mammals, the beaver is the most especially fitted to enjoy a social life.