References

Selected References
Alexander, R. M. 1991. How dinosaurs ran. Sci. Am. 264:130–136 (April). By applying the techniques of modern physics and engineering, a zoologist calculates that the large dinosaurs walked slowly but were capable of a quick run; none required the buoyancy of water for support.

Alvarez, W., and F. Asaro. 1990. An extraterrestrial impact. Sci. Am. 263:78–84 (Oct.). This article and an accompanying article by V. E. Courtillot, “A volcanic eruption,” present opposing interpretations of the cause of the Cretaceous mass extinction that led to the demise of the dinosaurs.

Cogger, H. G., and R. G. Zweifel (eds). 1998 Encyclopedia of reptiles and amphibians. San Diego, Academic Press. This comprehensive, up-to-date, and lavishly illustrated volume was written by some of the bestknown herpetologists in the field.

Crews, D. 1994. Animal sexuality. Sci. Am. 270:108–114 (Jan.) The reproductive strategies of reptiles, including nongenetic sex determination, provide insights into the origins and functions of sexuality.

Greene, H. W. 1997. Snakes: The evolution of mystery in nature. Berkeley, University of California Press. Beautiful photographs accompany a well-written volume for the scientist or novice.

Halliday, T. R., and K. Adler (eds). 1986. The encyclopedia of reptiles and amphibians. New York, Facts on File, Inc. Comprehensive and beautifully illustrated treatment of the reptilian groups with helpful introductory sections on origins and characteristics.

King, G. 1996. Reptiles and herbivory. London, Chapman & Hall. Explains the adaptations reptiles use in obtaining nutrients from a herbivorous diet.

Lillywhite, H. B. 1988. Snakes, blood circulation and gravity. Sci. Am. 259:92–98 (Dec.). Even long snakes are able to maintain blood circulation when the body is extended vertically (head up posture) through special circulatory reflexes that control blood pressure.

Lillywhite, H. B. 1988. Snakes, blood circulation and gravity. Sci. Am. 259:92–98 (Dec.). Even long snakes are able to maintain blood circulation when the body is extended vertically (head up posture) through special circulatory reflexes that control blood pressure.

Mattison, C. 1995. The encyclopedia of snakes. New York, Facts on File, Inc. Generously illustrated book treating evolution, physiology, behavior, and classification of snakes.

Norman, D. 1991. Dinosaur! New York, Prentice-Hall. Highly readable account of the life and evolution of dinosaurs, with fine illustrations.

Pough, F. H., R. M. Andrews, J. E. Cadle, M. L. Crump, A. H. Savitzky, and K. D. Wells. 1988. Herpetology. Upper Saddle River, New Jersey, Prentice Hall. A comprehensive textbook treating diversity, physiology, behavior, ecology, and conservation of reptiles and amphibians.

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