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The Reindeer, also known as a Caribou, is a species of deer native to the arctic. The Reindeer has four stomachs, to help them ferment and break down the tough plants they eat, and are the only mammals to eat lichens (and in fact, the only animals outside of snails that have the proper enzymes to digest lichens). Not all species of Reindeer migrate, but those that do can travel 5000 km. a year. These migratory herds can contain from 50,000 - 500,000 Reindeer. To help keep these herds together through thick snowstorms, the knees of some subspecies of Reindeer make clicking sounds. The Reindeer is thought to be one of the earliest domesticated animals, and Reindeer herders have existed since the Bronze Age. The Reindeer is one of the few animals that doesn’t behave on a 24 hour clock. Instead, its internal clock changes with the seasons (days in the Arctic can last much longer or much shorter than 24 hours).