Great Cormorant

Overview

The Great Cormorant is a large, widely distributed waterbird found across much of the Old World, Australasia, and parts of North America. Thriving in both marine and freshwater environments, this adaptable species is frequently observed in coastal waters, estuaries, rivers, and lakes. It is well-known for its expert diving abilities and its characteristic habit of perching with wings outstretched to dry its plumage.

Appearance

This robust bird is primarily black with a metallic sheen and a long, hooked bill featuring a yellow patch at the base. During the breeding season, adults develop distinctive white patches on their throat and thighs. While plumage is generally dark, young birds typically appear paler. They are distinguished from similar species by their heavy build, lack of a crest, and the absence of a green tinge to their feathers.

Biology & Behavior

Great Cormorants are agile swimmers that hunt by diving, often reaching depths of up to 20 meters. While they are generally silent, they may produce guttural sounds near their breeding colonies. Some populations are migratory, moving toward warmer coastal regions in winter, while others remain resident year-round. They often form large communal roosts in trees, on cliffs, or on artificial structures.

Feeding

As a piscivorous predator, the Great Cormorant feeds primarily on fish. It is an opportunistic hunter that catches prey underwater using powerful swimming strokes. A single individual may consume a significant amount of fish daily, often targeting the most abundant species available in its habitat.

Reproduction

These birds typically nest in colonies, often returning to the same site annually. Depending on the subspecies and location, nests are constructed from sticks and seaweed and may be situated on the ground, on cliff ledges, or in trees. Both parents share the responsibility of incubating the three to five eggs and feeding the young.