Adult males have a black-and-white body, a blue-green head, and an orange-red bill; adult females are brown with black patterning. The species breeds near water in the Arctic.
Adult males have a black-and-white body, a blue-green head, and a red bill topped by an orange plate. Adult females have intricate rusty-brown and black patterning.
It nests in Arctic tundra near water. At sea it dives for shellfish and other prey from the seafloor, and it winters near the edge of sea ice.
An extinction-risk assessment has not been added yet.