Caribou have the widest and roundest hooves of all deer species. Their large, concave hoofs are spread widely to support the animal in snow and soft tundra and function as paddles when caribou swim across lakes and rivers during migration.
Caribou scat differs in size and shape depending on the amount of moisture obtained in vegetation. During the winter, caribou eat lichens, sedges and small shrubs with high fiber contents that appears in small, concave pellets. In the summer, scat is seen as soft clumps of mass resulting from a diet of lush, wet vegetation.