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By: Travis Hartneck David Stacy Slide 2 Questions Asked: Why did the leg and body structure of horses evolve so drastically over a 55 million year stretch? What were the evolutionary steps involved in this change? Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Habitat Change Evasion of predators Change in diet Browsers to Grazers Expansion of range Slide 11 Franzen, J. L. (2006). The ris of horses 55 million years of evolution. Balitmore: The John Hopkins University Press. Lull, R.S. (1907). The evolution of the horse family, as illustratd in the yale collecions. American journal of science, 135(161), Retrieved from http://www.ajsonline.org/cgi/reprint/s4-23/135/161 MacFadden, B.J. (1992). Fossil horses. Cambridge: Cambridge University Press. MacFadden, B.J. (2005). Fossil horses evidence for evolution. Science, 307(5716), Retrieved from http://web.ebscohost.com/ehost/detail?hid=11&sid=3c50abc2-e151-415a-92e7- 4f7e0ef834be%40sessionmgr15&vid=2&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ% 3d%3d#db=a9h&AN=16555904 Simpson, G.G. (1951). Horses. New York: Oxford University Press.