These images taken in late September 2019 from a remote camera and provided by the National Park Service and the State University of New York College of Environmental Science and Forestry, show two wolf pups on Isle Royale National Park in Michigan. Gray wolves that were taken to Isle Royale to rebuild its nearly extinct population are forming social groups, staking out territory and apparently mating, scientists said Monday Sept. 14, 2020. (National Park Service and State University of New York College of Environmental Science and Forestry via AP)

In this 2020 photo photo provided by Michigan Technological University, one of twenty-five moose that were collared during the 62nd year of the Michigan Technological University Winter Study of Isle Royale National Park is seen on Isle Royale, Mich. In an annual report released Monday, Sept. 14 researchers with Michigan Technological University said they achieved a primary goal of a reintroduction initiative by reducing the park's moose herd, which has become too big for its own good. (Sarah Hoy/Michigan Technological University via AP)

In this 2020 photo provided by Michigan Technological University, a gray female wolf, right, courts a black male wolf, left, with a "play bow" invitation to engage during the 62nd year of the Michigan Technological University Winter Study on Isle Royale National Park in Mich. Gray wolves that were taken to Michigan's Isle Royale National Park to rebuild its nearly extinct population are forming social groups and staking out territory — promising signs despite heavy losses from natural causes and deadly fights, scientists said Monday, Sept. 14. (Rolf Peterson/Michigan Technological University via AP)