Great Cormorant vs Double-crested Cormorant

In short

The Great Cormorant and Double-crested Cormorant are similar in appearance but can be distinguished by their size and subtle plumage differences. The Great Cormorant is generally larger with a bulkier build, while the Double-crested Cormorant has distinctive crests during the breeding season.

Identification tips

1. Size and Build: Look for the larger size and bulkier build of the Great Cormorant. 2. Breeding Plumage: Check for crests on the Double-crested Cormorant during the breeding season. 3. Throat Patch: Look for the white throat patch on the Great Cormorant during breeding. 4. Habitat: Consider the habitat; Double-crested Cormorants are more likely inland, while Great Cormorants are often coastal.

Size

The Great Cormorant is larger and bulkier compared to the Double-crested Cormorant.

Plumage

The Great Cormorant typically has a more uniform dark plumage with a white patch on the throat during breeding, while the Double-crested Cormorant shows two small tufts or crests on the head during breeding season. Outside of breeding, both species appear similar with dark plumage.

Behaviour

Both species dive to catch fish, but the Great Cormorant is known to dive deeper, often up to 35 meters. The Double-crested Cormorant is more commonly seen in inland waters.

Habitat

The Great Cormorant is often found in coastal areas, while the Double-crested Cormorant is more frequently found in freshwater lakes and rivers.

Voice

Both species are generally silent but may produce guttural grunts. Specific vocal differences are not well-documented.