- 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.
Great Cormorant populations in the northwestern Atlantic appear to be stable. The North American Waterbird Conservation Plan estimates a continental breeding population of 11,600 birds, rate the species a 12 out of 20 on the Continental Concern Score, and list it as a Species of Moderate Concern. Great Cormorant are not listed on the 2014 State of the Birds Watch List. Populations were greatly reduced in 19th century, probably from direct persecution.