Caribou are a type of deer that are native to the Arctic and Subarctic regions of North America and Eurasia. They are the largest species of deer and can weigh up to 1,000 pounds. Caribou have thick fur to help them survive in the cold temperatures and are known for their migratory habits, as they travel great distances to find food and shelter. They are also important in maintaining the balance of the ecosystem and are often hunted for their meat and hides.