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The teeth of the black wildebeest have grown flatter because they are herbivores. Herbivores do not need to tear apart flesh in order to digest food and survive. They do need to grind plants such as grass. Ergo, the teeth have grown flatter to make them more effective for grinding.
The black wildebeest has become smaller. Evidence suggests that this is a result of not migrating and thus needing an immediate escape from predators. The smaller size allows it to run faster. Being that its body does not need endurance, its body is built for anaerobic activity.
Source: http://www.atlanticcoralenterprise.com/productcart/pc/catalog/fullskullwithhorns-blkwildebeestbottomside_1649_detail.jpg
Blue and black wildebeests have grown in differences because they live in different regions. Blue wildebeest live in dryer, lighter colored environments, so they ended up lighter in order to camouflage in their habitat. Black wildebeest live in a wetter, darker colored environment, thus they ended up darker. The blue wildebeest migrates long distances during the winter, so they are bigger and built for endurance running. The black wildebeest does not migrate, so it is built for sprinting to escape from predators.
Male wildebeest fight over females by butting their heads together. Originally, when the horns were higher on their heads, fighting caused more damage to their brains. So, their horns evolved to give more protection.
Over time, multiple changes have occurred in the black wildebeest:
*Note: All of these changes have occurred slowly over the course of one billion years.
Source: http://www.naturalhistorymag.com/htmlsite/0906/images/0906feature_closeup.jpg
Source: http://imgc.allpostersimages.com/images/P-473-488-90/38/3825/HF8YF00Z/posters/james-hager-two-black-wildebeest-fighting-mountain-zebra-national-park-south-africa.jpg
Source: Prezi