A reindeer typically lives in the Arctic tundra, where they are adapted to survive in the harsh conditions of the cold, snowy, and windy climate. Reindeer also thrive in dense forests and mountainous terrain, where they can forage for food and seek shelter in caves or rocky outcroppings. Some reindeer have even been domesticated and live on farms or ranches, where they are cared for by humans. Reindeer are highly mobile animals that can cover vast distances quickly, making them well-suited to their role as the flying reindeer of Santa's sleigh.