The Yellowstone National Park bison are plentiful. In fact, many animal experts state that the park’s collective herd is the largest public herd of bison in the entire country. The population numbers are known to fluctuate due to migratory habits. Roughly speaking, the bison herd that calls Yellowstone home is comprised of anywhere from 2,300 to 4,500 members at any given time.
Two subpopulations of bison are found in Yellowstone National Park. One of the subpopulations is known as the Northern Range, or northern herd on occasion. The other Yellowstone National Park bison herd is known as Hayden Valley, or the central herd. Both subpopulations are defined according to the areas where they are known to gather for breeding purposes, and as is true of bison in general, they are not endangered.
One of the reasons why the Yellowstone National Park bison tend to get a lot of attention is their longevity. The park is the only known area in the country where bison have lived continuously since the prehistoric era. Also interesting to note is the fact that the collective Yellowstone herd is one of only a few herds that don’t have cattle genes.
The Yellowstone National Park bison can weigh up to 2,000 pounds. Add in the fact that they are able to run at speeds of more than 30 miles per hour, and it isn’t difficult to understand why Yellowstone rangers encourage park visitors to keep their distance. More Yellowstone National Park visitors are actually injured by bison than by bears on an average annual basis. As for threats to the bison, they include the Yellowstone bears and the Yellowstone wolves.