Their numbers will be raised by reintroducing species that went locally extinct (e.g., muskoxen). The region is known for its wildlife, including polar bears, muskoxen, and seals. Three quarters of the world's population of muskoxen roam the island. The researchers found that wolves prey mainly on the muskoxen. There is no available information of the wolves' movements where the muskoxen were. In the wild, Arctic wolves primarily prey on muskoxen and Arctic hares. Rare "white muskoxen" have been spotted in the Queen Maud Gulf Bird Sanctuary. Both male and female muskoxen have long, curved horns. The mating (or "rutting") season of the muskoxen begins in late June or early July. Caribou are survivors of the ice age environment in the preserve, together with reintroduced muskoxen. Wild muskoxen have qiviut fibers approximately 18 micrometres in diameter. The preorbital gland secretion of muskoxen has a "light, sweetish, ethereal" odor. Occasional sightings of muskoxen have been made near Cape Chidley, Labrador's most northerly point. However, muskoxen have since been reintroduced to Alaska. Within these areas, muskoxen receive full protection.