Links and Bibliography
-http://www.pbs.org/wgbh/evolution/
-http://en.wikipedia.org/wiki/Evolution_of_cetaceans
-http://humanorigins.si.edu/human-characteristics/walking
-http://www.spaceandmotion.com/Charles-Darwin-Theory-Evolution.html
-http://www.youramazingbrain.org/insidebrain/brainevolution.html
-http://ngm.nationalgeographic.com/ngm/data/2002/01/01/html/ft_20020101.1.html
-http://en.wikipedia.org/wiki/Evolution_of_the_horse
-http://dinosaurs.about.com/od/mesozoicmammals/a/elephants.htm
