 Additionally, more than 10,000 invertebrate species are present, including 180 mollusks and 30 crustaceans.Montana has the largest grizzly bear population in the lower 48 states.Montana hosts five federally endangered species–black-footed ferret, whooping crane, least tern, pallid sturgeon, and white sturgeon and seven threatened species including the grizzly bear, Canadian lynx, and bull trout.