- 33.1–35.4 in
- 51.2–63 in
- 91.7–130.5 oz
Breeds along rocky maritime coasts, nesting on cliff ledges or rocky islands free of predators, and feeding in sheltered inshore waters. Winters along coast.
- Clutch Size
- 1–7 eggs
- Egg Description
- Pale bluish green with white chalky covering.
- Condition at Hatching
- Naked and helpless, with black skin.
On rocks, nest is a mound or heap of seaweed and sticks; in trees, nest is a solid stick structure lined with grasses and feathers. Nests colonially, often with Double-crested Cormorants and gulls.
Dives from the surface of the water and chases prey underwater. Grabs fish in bill, without spearing it.
Populations greatly reduced in 19th century, probably from direct persecution; increased since early 20th century. Numbers in northwestern Atlantic not changing rapidly at present.