A caribou is a large member of the deer family, and is also known as a reindeer. They are typically found in northern regions such as Alaska and Canada, and are the species that Santa's reindeer are based on. Caribou are well-adapted to cold temperatures and harsh environments, and are known for their impressive antlers and powerful hooves. They are also known for their ability to migrate long distances in search of food and water. In many cultures, the caribou is seen as a symbol of endurance and strength.