Caribou and reindeer are actually the same species, known as “reindeer” in Europe and as “caribou” in North America. “Reindeer” typically refers to domesticated individuals, even in North America. Both male and female caribou have antlers, and in comparison to body size, they’re the largest and heaviest antlers of all living deer species. They dig for food using their large hooves, which are hollowed out on the underside like a big scoop. Caribou trek north as herds in the summer in one of the largest animal migrations on Earth: more than 600 miles along well-traveled routes.