Kingdom:Animalia
Filum: Chordata
Class:Mamalia
Ordo: Artiodactyla
Famili: Bovidae
Subfamili: Bovinae
Genus: Bison
Hamilton Smith, 1827Species
† B. antiquus
B. bison
B. bonasus
† B. latifrons
† B. occidentalis
† B. priscus
Bison is an even-numbered mammal group, They form the Bison genus of the Bovinae subfamily and familia Bovidae, Bison lives in the northern part of the earth,American Bison lives in North American, They lived until they were 20 years old,and born without horns. 
Bison is the largest land animal found only in America and Europe,In America, bison usually live in river basins as well as plains of grasslands and dense terraces because they are animals whose main food is grass and bushes. 
While European bison mostly live in forests that are not too dense and in the plains are overgrown with bushes, Bison is a horned mammal animal that lives in groups. but unlike most animal groups. bison flocks are usually grouped by sex and they will meet with other groups when the breeding season has arrived.
In the 1800s the American bison was once declared almost extinct. as its population continued to drop dramatically as a result of human hunting and also clearing land for settlements, Seeing that some breeders initiated to start developing bison farms and not just catch wild bison until finally the bison population can come out of the extinction ravine even though some species of bison still can not be saved