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Yellowstone  The Yellowstone Park bison herd in Yellowstone
National Park is probably the oldest and largest public bison
herd in the United States. Yellowstone is known for its
geothermal activity and large mammals, especially elk, wolves,
American bison, bears, pronghorns, moose and bighorn sheep. The
Yellowstone Park bison herd is estimated at approximately 3,700
individuals (2011) in two major sub-herds.[1] The bison in the
Yellowstone Park bison herd are American bison, and of the
Plains bison subspecies. Yellowstone National Park may be the
only location in the United States where free ranging bison were
never extirpated, since they continued to exist in the wild and
were not re-introduced as has been done in most other bison herd
areas. Other large free ranging, publicly controlled herds of
Bison in the United States include the Wind C