The Caribou are also a thriving animal in the Tundra. Here are a few adaptations that make them suitable to this biome: In the winter the fleshy pads of their hoofs shrink and the hair between their toes covers the pads to keep the caribou warm. Probably the biggest adaptation, caribou are one of the few animals that are adapted to feed on lichens. They have a large stomach that digests lichens. The outside hair is hollow and this does two things; it acts as a insulating layer to conserve body heat and allows them buoyancy when swimming. Their coat fades to light beige as a camouflage against predators.