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I wanted to write the kind of book I'd enjoy reading. And, I intended to follow the time-honored advice to write about what I know. I am happy to report that I did both in Observing Evolution. My hope now is that a broad audience will enjoy my book, and will...

Freshwater semi-aquatic mammals represent some of the world’s rarest species living within some of its most threatened habitats. Better known species, including the platypus, North American and Eurasian beavers, the common hippopotamus, and various species of...

Herpetologists have no idea how many lizard species there are. When I started planning Lizards of the World there were about 3000 species known worldwide. When I finished my data collection there were 6528; now there are over 7100. Is the true number 10,000 or...

The history of Walker’s Mammals of the World goes back to the 1930s, when Ernest P. Walker, assistant director of the National Zoological Park in Washington, began assembling data and imagery. First published in 1964, it became a Johns Hopkins University Press...