Even though it is a very harsh climate Wrangel island has a large and diverse wildlife population. It is the world's largest Polar Bear denning ground. There are about 400 female bears who raise their young here. It has the world's largest population of Pacific Walrus. The island has large populations of Snow Geese, Snowy Owls, seals, Arctic wolves, Arctic fox and lemmings. One thing the island seems to be missing is mosquitoes.