Caribou are a species of large, hoofed mammals that are native to the Arctic and Subarctic regions of North America, Europe, and Asia. They are well-known for their ability to survive in harsh climates and are an important food source for many Arctic predators, including the lichen eater. Lichen eaters are animals that feed on lichens, which are a type of composite organism composed of fungi and algae. CARIBOU are one of the few animals that can survive on a diet of lichens, making them an important part of the Arctic ecosystem.