The American Bison (Bison
bison), also called Buffalo, is a bovine mammal that is the largest
terrestrial mammal in North America. The bison inhabited Great
Plains of the United States and Canada in massive herds, ranging
from the Great Slave Lake in Canada's far north to Mexico in the
south, and from eastern Oregon almost to the Atlantic Ocean. Its
two subspecies are the Plains Bison (Bison bison bison), distingushed
by its flat back, and the Wood Bison (Bison bison athabascae),
distingushed by its large humped back.
Bison have a shaggy, dark brown winter coat, and a lighter brown
(and lighter weight) summer coat. Bison can reach over 2 m (6
feet) tall, 3 m (10 ft) long and weigh over 900 kg (2,000 pounds).
The heads and forequarters are massive, and both sexes have short,
curved horns, which they use in fighting for status within the
herd and defense. Bison mate in August and September; a single
reddish-brown calf is born the following spring, and nurses for
a year. Bison are mature at three years of age, and have a life
expectancy of 18–22 years.
Above Images Come From The US Fish & Wildlife Service