Question 17.2: Zoo mortality
----Clubb, R. and G. Mason. 2003. Nature 425: 473-474.
Question 17.3:Progesterone
----Brutsaert, T. D., et al. 2002. Journal of Experimental Biology 205: 233–239.
Question 17.4:Body fat / heat loss
----Sloan, R. E. G. and W. R. Keatinge. 1973. Journal of Applied Physiology 35: 371-375.
Question 17.7: Hybrid pollen sterility
----Moyle, L. C., M. S. Olson, and P. Tiffin. 2004. Evolution 58: 1195–1208.
Question 17.8: Rattlensake digestion
----Tattersall, G. J., W. K. Milsom, A. S. Abe, S. P. Brito and D. V. Andrade. 2004. Journal of Experimental Biology 207: 579-585.
Question 17.9: Lizard bites
----Lappin, A. K., and J. F. Husak. 2005. American Naturalist 166: 426–436.
Question 17.11: Hypoxanthine
----James, R. A., P. A. Hoadley, and B. G. Sampson. 1997. American Journal of Forensic Medicine and Pathology 18: 158-162.
Question 17.12: Social spiders
----Rypstra, A. L. 1979. Behavioral Ecology and Sociobiology 5: 291-300.
Question 17.14: Grassland nutrients
----Harpole, W. S. and D. Tilman. 2007. Nature 446: 791-793.
Question 17.15: Earthworms and nitrogen
----Gundale, M. J., W. M. Jolly, and T. H. Deluca. 2005. Conservation Biology 19:1075–1083.
Question 17.16: Primate mass and metabolic rate
----Heusner, A. A. 1991. Size and power in mammals. Journal of Experimental Biology 160: 25-54.
Question 17.18: Flycatcher patch
----Griffith, S. C. and B. C. Sheldon. 2001. Animal Behaviour 61: 987–993.
Question 17.19: Tree seedlings and sunflecks
----Leakey, A. D. B., J. D. Scholes and M. C. Press. 2005. Journal of Experimental Botany, 56: 469-482.
Question 17.20: Penguin treadmill
----Green, J. A., P. J. Butler, A. J. Woakes, I. L. Boyd and R. L. Holder. 2001. The Journal of Experimental Biology 204: 673–684.
Question 17.21: Beetle wings
----Emlen, D. J. 2001. Science 291: 1534-1536.
Question 17.22: Daphnia parasites
----Jensen, K. H., T. Little, A. Skorping, and D. Ebert. 2006. PLoS Biology 4: 1265-1269.
Question 17.24: Mosquito bites
----Golenda, C. F., et al. 1999. American Journal of Tropical Medicine and Hygiene 60: 654–657.
Question 17.25: Nuclear teeth
----Spalding, K. L.. et al. 2005. Nature 437: 333-334.