A male's antlers are bigger than a female's. Caribou have a lot of fur. Most caribou have little bugs in their fur where they make little nests in them. The caribou's ears and tail have fur all over it. The ears and tail are so small for such a big animal.
Caribou eat plants while browsing like willow.
Muskrat dens are made from dried plants and grasses. There are two kinds of caribou that live in North America. One lives in the forests and mountains. They are called woodland caribou. The other is called barren-ground caribou.