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Herpetology An Introductory Biology of Amphibians and Reptiles Fourth Edition Laurie J. Vitt and Janalee P. Caldwell Sam Noble Museum and Biology Department University of Oklahoma Norman, Oklahoma AMSTERDAM • BOSTON • HEIDELBERG • LONDON • NEW YORK • OXFORD • PARIS SAN DIEGO • SAN FRANCISCO • SYDNEY • TOKYO Academic Press is an Imprint of Elsevier Herpetology: An Introductory Biology of Amphibians and Reptiles