The book also introduces readers to prehistoric mustelids, a family of carnivores that includes weasels, badgers and wolverines. These ancient mammals were far larger than their modern relatives.

A new book explains how biases from sexism, homophobia, racism, and much more have tainted the science of animal behavior and ...

"Modern mammals' bones migrated backward to become ... of genes in a living animal's DNA like an evolutionary history book. The scientists can then determine how closely these animals are related ...

Although they came into their own only after the extinction of the dinosaurs some 65 million years ago, mammals had maintained a low-profile existence for some 150 million years before that.