赤頸鸊鷉 Podiceps grisegena

Large grebe; much larger than Eared or Horned Grebe with a longer neck and bill. Reddish neck, silver cheek, and black cap distinctive in breeding plumage. In winter, look for smudgy brown neck, whitish throat, and long, mostly yellow bill. Juveniles have stripes on face. Breeds on lakes and marshes in northern North America, Europe, and Asia. Builds a floating nest of plant matter. Winters mainly on the ocean, sometimes gathering in large flocks. Dives to feed on fish.