 It is bordered in the southeast by Wood-Tikchik State Park, the largest state park in the United States.The refuge is home to 48 mammal species, 31 of which are terrestrial and 17 marine.More than 150,000 caribou from two herds, the Nushagak Peninsula and the Mulchatna, make use of refuge lands, which they share with wolf packs, moose, brown and black bear, coyote, Canadian lynx, Arctic fox, muskrat, wolverine, red fox, marmot, beaver, marten, two species of otter, and porcupine, among other land mammals.