Colimbo Chico vs Colimbo del Pacífico

The Red-throated Diver and Pacific Diver can be distinguished primarily by their breeding plumage and habitat preferences. The Red-throated Diver features a distinctive red throat patch, while the Pacific Diver is known for its more uniform plumage. Both species breed in Arctic regions but differ in their foraging and nesting behaviors.

Red-throated Diver: Look for the red throat patch during breeding season. Pacific Diver: Note the more uniform plumage and marine habitat outside of breeding season.

The Red-throated Diver is characterized by its red throat patch during the breeding season, contrasting with the more uniform gray and white plumage of the Pacific Diver.

The Red-throated Diver is a central-place forager, flying between breeding lakes and marine foraging areas, while the Pacific Diver is strictly marine outside its breeding season.

The Red-throated Diver breeds on small Arctic and boreal lakes and forages in marine environments, whereas the Pacific Diver nests on freshwater ponds in the Arctic and Subarctic but is otherwise marine.

The Red-throated Diver's breeding call is described as cacophonous, differing from the Pacific Diver, though specific vocalization details for the latter are not provided.