Did you know that when two bull hippos yawn at each other, they aren't actually tired, but displaying territorial ownership? Find out more intriguing facts in this comprehensive guide to the natural world of mammals. Covers everything from what separates us from other groups of species - birds, fish, spiders and insects - to the evolution of mammals over the last 200 million years.
This is Book 81 in the Eyewitness Series. See all Eyewitness books here.
Steve Parker is an author, editor and consultant specializing in illustrated information books on the natural world. Steve is a Senior Scientific Fellow of the Zoological Society of London and has worked on the staff of London's Natural History Museum. He is based in Suffolk, UK, and has written over 250 books, including information-packed dinosaur titles su
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