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In mammals, females are XX while males are XY so a woman should never be able to provide the necessary Y chromosome genes to produce a son.

Any of the long, stiff hairs that project from the snout or brow of most mammals , as the whiskers of a cat .

A horse has considerably wide vision (and the largest eyes of any land mammal) - being able to see a total field of up to 350 degrees.

I thought about this little book, because the author has this in common with me that for him the question of mammals has been resolved.

Dr Simpson's analysis indicates that the relationship between dinosaurs and mammals was actually that of a diner to his lunch.

No one has ever before documented the spread of a learned behavior through a population of these marine mammals over a short period of time.

Of the one-and-a-half million fungal species on Earth, only a few hundred are capable of infecting mammals.

In Antarctica, the only mammals are those that stay for just a short time -- marine mammals like whales and seals.

The mammal is distinguished by an unusual breeding cycle that occurs every 18 months and has pups suckle for a year and a half.