American Bison (Bison bison)
Early American settlers called bison “bufello” due to the similar appearance between the two animals, and the name "buffalo" stuck for the American variety. But it's incorrect. The American Bison lives only in North America, while the two main buffalo species reside in Africa and Asia. A small population of bison relatives called the European Bison (Bison bonasus) lives in isolated parts of Poland.
Yellowstone and Grand Teton bison herds are prolific and multiply rapidly. Range biologists say that Yellowstone can handle about 3,000 bison and Grand Teton Park can handle 600.
The information above, and additional information, can be found at Yellowstone Wildlife.
The Bison's Hump - Life in deep snow has selectively shaped bison anatony. Above the neck and shoulders, large muscles attached to bony spinal projections give the dark heads tremendous excavating power.