They live throughout most of Alaska and Canada.
Caribou are migratory , and often travel in large herds.
They are good swimmers . The major predators of caribou are humans and wolves, but young caribou are also in danger from grizzly bears, wolverines, lynx, and golden eagles. Bulls shed their antlers in the late fall, but females keep their antlers until late spring. Both rodents and caribou gnaw on fallen antlers as a source of calcium.