sentence: Large herds feed on the grass and lichens.
sentences_before: Caribou and their relative, the reindeer, live in the Arctic too. The caribou are now found mostly in North America, and they are larger than the reindeer.
sentences_after: When fall comes,s they move south to winter feeding grounds. They dig through the snow with their sharp hoofs for food. Their hollow fur creates a cushion of air around them that helps them to stay warm. In the spring they return north to the summer pastures, where their calves are born. An hour or so after being born, the calves are able to follow the herd toward the Arctic Ocean.
concept_name: large herd
headings: Arctic Animal life
categories: Arctic