Great Cormorant vs Rock Shag
Phalacrocorax carbo compared with Leucocarbo magellanicus
Side-by-Side Comparison
| Attribute | Great Cormorant | Rock Shag |
|---|---|---|
| Scientific Name | Phalacrocorax carbo | Leucocarbo magellanicus |
| Order | Suliformes | Suliformes |
| Family | Phalacrocoracidae | Phalacrocoracidae |
| Conservation Status | Least Concern | Least Concern |
| Length | 90.0 cm (35.4 in) | — |
| Wingspan | 145.0 cm (57.1 in) | 50.1 cm (19.7 in) |
| Weight | 2600.0 g (91.71 oz) | 1500.0 g (52.91 oz) |
| Diet | Fish caught by diving from the surface. Pursues prey underwater using powerful feet for propulsion. … | -- |
| Clutch Size | 1-7 | 2-4 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Great Cormorant
Coasts, estuaries, lakes, rivers, and reservoirs. Nests in colonies in trees, on cliffs, or on the ground.
Song & Call Comparison
Great Cormorant
Deep, guttural grunts and 'karrr' calls at colonies. Bill-clicking and hissing in threat displays. Silent at sea. Colonial noise can be deafening during the breeding season.
Rock Shag
Geographic Range & Migration
Great Cormorant
Very wide range across Europe, Asia, Africa, and Australasia. One of the most widespread cormorant species.
Rock Shag
Conservation Status
Great Cormorant
Rock Shag
How to Tell Them Apart
Great Cormorant
All black with a bronze-green gloss. White throat patch and white thigh patches in breeding season. Yellow-orange face patch around the bill base.
Long, hooked, dark bill with a yellow gape
Rock Shag
About These Birds
Great Cormorant
The great cormorant is one of the most widespread seabirds in the world. Unlike most waterbirds, cormorants lack fully waterproof plumage, leading to the iconic pose of standing with wings spread open to dry. In Asia, cormorants have been used by fishermen to catch fish for over a thousand years.
Rock Shag
60–66 cm. Black above; white below; vivid red-orange caruncles at bill base in breeding. Breeds coasts and islands of southern Chile, Argentina, and Falkland Islands. Feeds on fish in cold sub-Antarctic inshore waters. Nest on cliff ledges in small colonies; resident.