Glossary
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         deciduous: 
 type of tree that loses its leaves during periods of drought or harsh 
 weather (e.g. a maple tree losing its leaves each fall) (Campbell and Reece 
 2002)
      digitigrade: 
 "toe walking," in which the metatarsals/metacarpals contact the ground 
 (like a person on tiptoe). Used by e.g. dogs and cats (Damman et al. 
 2005) 
      dorsal stripe: 
 dark stripe running from the withers to the base  of the tail (Clutton-Brock 
 1992)
      grassland: 
 biome dominated by grasses
      hh (hands high): 
 unit of measutring horses, from the ground to  the withers. One hand is equal
 to to 4 inches (~10 cm) (Clutton-Brock 1992)
      orthogenesis: 
 "straight-line evolution," where there is a single,  linear path from ancestor 
 to descendant, with no side branches (MacFadden 1994)
      savanna: 
 type of tropical grassland with spaced-out  individual trees and
 distinct seasons (Campbell and Reece 2002)
         ungulates: 
 hoofed animals (MacFadden 1994)
         unguligrade: "claw 
 walking," in which the tonails contact the ground (like a ballet dancer). 
 Used by e.g. horses and deer (Damman et al. 2005)