But which mammals are their closest relatives, and when did whales enter the seas?
Sure, these two mammals live on different poles and would never actually meet.
The human species is no more unsuited to give birth than any other of the 5,000 or so species of mammals on the planet.
And this is true of virtually all companies, just as it was true of dinosaurs and mammals.
In his scheme, the limbic system evolved alongside the developing social complexity of the mammals.
Out of ninety-eight species of mammals contemporary with early man in Europe, forty-one Fig. 191.
Of all mammals, the beaver is the most especially fitted to enjoy a social life.
It was said to exceed all other American mammals in ferocity of disposition and muscular strength.
Let us take, by way of example, one or two cases among the mammals.
Later still, and more heterogeneous still, are Birds and mammals.
1826, anglicized form of Modern Latin Mammalia (1773), coined 1758 by Linnaeus for the class of mammals, from neuter plural of Late Latin mammalis "of the breast," from Latin mamma "breast," perhaps cognate with mamma.
Any of various warm-blooded vertebrate animals of the class Mammalia, whose young feed on milk that is produced by the mother's mammary glands. Unlike other vertebrates, mammals have a diaphragm that separates the heart and lungs from the other internal organs, red blood cells that lack a nucleus, and usually hair or fur. All mammals but the monotremes bear live young. Mammals include rodents, cats, dogs, ungulates, cetaceans, and apes.