Reindeer, or caribou, live throughout the circumpolar regions of northern Europe, Siberia and North America. The habitats of reindeer include tundra, boreal forests and mountains. Reindeer were first domesticated thousands of years ago in northern Europe and Asia before being introduced to North America.
Reindeer have widespread populations, although some subspecies are rarer than others. Female reindeer in most populations grow antlers, while male antlers are often larger. As ruminants, reindeer are herbivorous and subsist on a diet of plants and lichens native to cold climates. In extreme conditions, reindeer are known to feed on small rodents, fish and eggs. Male reindeer usually weigh between 350 and 400 pounds, and females typically grow no larger than 260 pounds.