The Four Keys to ID
- Size & Shape
A very small seabird with a chunky body, very short tail and neck, and a small stubby bill. The wings are short and narrow.
Relative Size
Larger than a Red-necked Phalarope, smaller than a Black Guillemot.
between robin and crow
Measurements
- Both Sexes
- Length: 7.5-9.1 in (19-23 cm)
- Weight: 4.7-7.2 oz (134-204 g)
- Wingspan: 15.0 in (38 cm)
© Rob Martin / Macaulay Library
- Color Pattern
Breeding adults are black above with a black breast and white belly. They have white-edged wing feathers, a small white mark behind the eye, and gray mottling on the flanks. Nonbreeding adults lack the black breast and show a partial white collar. Immatures have a brownish cast to the upperparts.
© Heidi Krajewsky / Macaulay Library - Behavior
Feeds by diving underwater, using wings to swim after prey in a zig-zag pattern as the bird ascends toward the surface. Often forages in large flocks, far out to sea.
© Alix d'Entremont / Macaulay Library - Habitat
Nests on rocky islands, cliffs, scree, and talus slopes. Forages in marine environments where small zooplankton concentrate: along sea ice edge and where upwelling brings nutrients toward the surface, usually over the continental slope or banks far offshore.
© Jeremiah Trimble / Macaulay Library