![]() ![]() But inbreeding finally took its toll on the wolves, whose numbers plummeted between 20. Both populations rose and fell over the years, influenced by disease, weather, parasites and other factors. Moose provided an ample food supply for the wolves, which in turn helped keep moose numbers in check. Though technically part of Michigan, that state’s shores are farther away. Wolves arrived in the late 1940s, apparently crossing the frozen lake surface from Minnesota or the Canadian province of Ontario. Scientists believe the island’s first moose swam to Isle Royale around the turn of the 20th century.
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