References
          
          
          Books:
          Benton, M.J. 2000. Vertebrate Palaeontology, 2nd ed. London: 
  Blackwell   Science Ltd. 
      Benton, M. and D. Harper. 1997. Basic Palaeontology. Toronto:
 Pearson   Education Ltd. 
      Campbell, N.A. and J.B. Reece. 2002. Biology, 6th ed. New York:
   Benjamin  Cummings. 
          Clabby, J. 1976,. The Natural History of the Horse. London:
  Weidenfield    and Nicolson.
          Clutton-Brock, J. 1992. Horse. London: Dorling Kindersley
 Ltd.   
        Davidson, J.P., W.E. Reed and P.M. Davis. 2002. Exploring Earth. 
   Upper Saddle River: Prentice Hall. 
        Draper, J. 1996. The Complete Horse Book. London: Anness Publishing
     Ltd. 
          Harwood, J. 1996. Horse Identifier. North Dighton: Quarto
 Publishing.
          Johnson, P.H. 1967. Meet the Horse. New York: Grosset &
  Dunlap.    
          MacFadden, B.J. 1992. Fossil Horses: Systematics. Paleobiology,
  and   Evolution  of the Family Equidae. New York: Cambridge University
  Press.   
          Prothero, D.R. 1998. The chronological, climatic, and paleogeographic
    background  to North American mammalian evolution. In: Janis, C.M., K.M.
    Scott and L.L.          James (eds.) Evolution
    of Tertiary Mammals  of North America, Vol.1. New York: Cambridge
University    Press.  
   Simpson, G.G. 1951. Horses: The Story of the Horse Family in the Modern 
 World and through Sixty Million Years of History. Oxford University Press.
 
   Sterry, 1994. Horses: A Portrait of the Animal World. New York: 
  Todtri  Productions Ltd.
          
          Journals:
          Azzaroli, A. 1992. Ascent and decline of monodactyl equids:
  a  case   for prehistoric overkill. Ann.Zool.Fennici, 28:151-163.
   
          Gould, S.J. 1987. Life's little joke. Natural History, 96(4):16-25.
     
          Janis, C.M., J. Damuth and J.M. Theodor. 2002. The origins of the 
 North    American grassland biome: the story from the hoofed mammals. Palaeogeography, 
                    
        Palaeoclimatology, Palaeoecology, 177: 183-198.
    
          MacFadden, B.J. 1994. The heyday of horses. Natural History, 
  103(4):63-56.   
          
         Websites:
          Hunt, K. 1995. Horse Evolution. The Talk Origins Archive. http://www.talkorigins.org/faqs/horses/horse_evol.html
     (March 31 2005).
          Kazlev, M.A. 2002. The Cenozoic Era. Palaeos: The Trace of Life
  on  Earth.  http://www.palaeos.com/Cenozoic/cztimescale.html
     (March 31 2005). 
          Smithsonian Institution. 2000. The Cenozoic. The Smithsonian 
Institiution     Human Origins Program: Geologic Time.     
                    
                    
                    
            
                  http://www.mnh.si.edu/anthro/humanorigins/faq/gt/cenozoic/cenozoic.htm
     (March 31 2005).
          WGBH/NOVA Science Unit and Clear Blue Sky Productions. 2001. Cenozoic 
   Era.  Evolution. http://www.pbs.org/wgbh/evolution/change/deeptime/cenozo.html
                 (March 31 2005).
          
     Other:
     Bourdelais, S. 1997. The 55 Million-Year-Old Horse. Horsepower, 
    10(4):35-36. 
     Damman, H., J. Mallet and S. Peck. 2005. Animals: Form and Function 
 Laboratory  Manual. Ottawa: Carleton University Press.  
          
     Picture Credits:
         grsites.com 2005. Absolute Background Textures Archive. http://www.grsites.com/textures/
    (January 31 2005)
         Smithsonian Institution. 2000. The Cenozoic. The Smithsonian
Institiution      Human Origins Program: Geologic Time.    
                    
                    
                    
             
                  http://www.mnh.si.edu/anthro/humanorigins/faq/gt/cenozoic/cenozoic.htm
     (March 31 2005).