A new book brings readers into this world with well-researched species profiles by Aaron Woodruff, collection manager for vertebrate paleontology at the Florida Museum of Natural History.

"During the Mesozoic, mammals were small," University of Georgia Odum School of Ecology professor John Gittleman said in a ...

These molecular biologists read the sequences of genes in a living animal's DNA like an evolutionary history book ... Mammals fit that profile. They suddenly found themselves in a world without ...