Near Munising, Michigan a pair of American bald eagles has built a large untidy nest on Grand Island in the tallest tree. They have a clear view of their surroundings and an uobstructed flight path to an inland lake on the island. Just as other bald eagles, the pair mate for life and return to their nest year after year.
Protecting their nesting territory which has an invisible radius of fifteen miles around it, the male of the pair rushes at an immature eagle--his voice like an unoiled hinge. Startled by this display, the young eagle takes flight. Seeing that he has successfully defended his territory, the eagle returns to his mate.