Bison Pet

In some areas, wolves are a major predator of bison. Wolf predation typically peaks in late spring and early summer, with attacks usually being concentrated on cows and calves. Observations have shown that wolves actively target herds with calves over ones with none.
Bison display five apparent defense strategies in protecting calves from wolves. These include running to a cow, running to a herd, running to the nearest bull, run in the front or center of a stampeding herd, and entering water bodies such as lakes or rivers. When fleeing wolves in open areas, cows with young calves take the lead, while bulls take to the rear of the herds, to guard the cows' escape. The length of a bison hunt varies, ranging from lasting a few minutes to 11 hours. Bison typically ignore wolves not displaying hunting behavior. Packs specializing in bison tend to have a greater number of males, as their superior size to the females allows them to wrestle bison to the ground more effectively. The grizzly bear can also pose a threat to calves and sometimes adult bison.