Cheney, D.L. and Seyfarth, R.M.: "How Monkeys See the World: Inside the Mind of Another Species," University of Chicago Press, 1990. A good reference on animal awareness and the complexity of animal communication.

Crews, D.: "The Annotated Anole: Studies on the Control of Lizard Reproduction," American Scientist, vol. 65, pages 428–34, 1977. A fascinating account of how seasonal and social changes trigger the hormonal events that lead to reproduction.

Gould, J. and P. Marler: "Learning by Instinct," Scientific American, January 1987, pages 74–85. A clear and interesting account of the relative roles of instinct and learning in behavior. The authors, prominent behaviorists, argue that learning is often limited or controlled by instinct.

Greenspan, R.J.: "Understanding the Genetic Control of Behavior", Scientific American, 1995, vol. 272, pages 72–105. Thorough and interesting review of the genetic dissection of courtship behavior in the fruit fly.

Huber, F. and J. Thorson: "Cricket Auditory Communication," Scientific American, December 1985, pages 60–68. An unusually clear example of how nervous system activity underlies animal behavior.

Packer, C. and A.E. Pusey: "Divided We Fall: Cooperation among Lions," Scientific American, May 1997, pages 52–59. Lions share a complex social organization, all of which can be understood in terms of promoting individual survival.

Rose, K.: The Body in Time, New York, Wiley & Sons, 1988. A fascinating journey through the human clock—how our body keeps time.