Great northern loons with chick, Sleeping Bear Dunes National Lakeshore, 2015.
You may know the great northern loon as the common loon (Gavia immer). These adults are still in breeding plumage, with a black head, white underparts and a checkered black-and-white mantle. After breeding season the plumage returns to shades of brown with a white chin and foreneck. From a distance you may be able to easily see recognize the common loon by its horizontal bill positioning. Amazingly, the loon has a number of solid bones, which is very unlike the normally-hollow avian bones. This extra weight aids in the loon's diving prowess but may also be one of the reasons the bird requires a long distance to gain momentum for flight take-off. Loons have the ability to dive as deep as 60 meters (200 feet) for as long as 3 minutes. Like all divers, this species is a specialist fish-eater.
U.S. National Park Service
Permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this website.