Dinosaurs of the Air: The Evolution and Loss of Flight in Dinosaurs and Birds. Gregory S. Paul. Johns Hopkins University Press, Baltimore and London. 2002. i–xii + 460 pages ISBN 0-8018-6763-0. Cloth $49.95.

Reconstructing the origin of birds and the origin of their flight is anything but a simple problem. In fact, this issue, often treated as a single problem, comprises many problems that, although logically independent and approached with different methods, are involved with each other simply because they are part of a single historic evolutionary radiation. So, whereas the origin of birds—that is, their relationships to other animals—is...

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