Great Lakes Habitat Common loons breed on clear, relatively non-acidic, freshwater lakes in northern Michigan, Wisconsin and Minnesota. They prefer lakes with islands or sheltered areas of shoreline, which provide safe nesting and nursery areas for their chicks. Occasionally loons also might nest on larger rivers or sheltered areas of Great Lakes shoreline.
Loons eat lots of fish, so they’ll look for lakes with an abundant supply of fish. Loons also will eat crayfish, snails, leeches, frogs, salamanders and aquatic insects.