References and Further Reading

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Alcock, J. Animal Behavior: An Evolutionary Approach. 5th Edition. Sunderland, MA: Sinauer Associates, 1993.

Brower, L. Monarch butterfly orientation: missing pieces of a magnificent puzzle, Journal of Experimental Biology 199: 93-103, 1996.

Campbell, S.S. and Murphy, P.J. Extraocular circadian phototransduction in humans, Science 279:396-399, 1998.

Dark, J., et al. Gonadectomy in the spring reinstates hibernation in golden-mantled squirrels, American Journal of Physiology 270:R1240-1243, 1996.

Follett, B.K., et al. Circadian function in the photoperiodic induction of gonadotropin secretion in the white-crowned sparrow, Zonotrichia leucophrys gambelii, Proceedings of the National Academy of Sciences USA 71:1666-1669, 1974.

Frerichs, K. U., et al. Suppression of protein synthesis in brain during hibernation involves inhibition of protein initiation and elongation, Proceedings of the National Academy of Sciences USA 95:14511-14516, 1998.

Gwinner, E. Circadian and circannual programmes in avian migration, Journal of Experimental Biology 199:39-48, 1996.

Inouye, D. W., et al. Climate change is affecting altitudinal migrants and hibernating species, Proceedings of the National Academy of Sciences USA 97:1630-1633, 2000.

Nelson, R.A., et al. Ratio of serum urea to serum creatinine in wild black bears, Science 226:841-842, 1984.

Ruby, N. F., et al. Ablation of suprachiasmatic nucleus alters timing of hibernation in ground squirrels, Proceedings of the National Academy of Sciences USA 93:9864-9868, 1996.

Wingfield, J.C., et al. Interrelationship of day length and temperature on the control of gonadal development, body mass, and fat score in white-crowned sparrows, Zonotrichia leucophrys gambelii, General and Comparative Endocrinology 101:242-255, 1996.

Young, M.W. The tick-tock of the biological clock, Scientific American March: 64-71, 2000.

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http://www.sciam.com (This is the URL for Scientific American. Use "circadian" as the search term).