European Shag vs Double-crested Cormorant

In short

The European Shag and Double-crested Cormorant are both large, dark waterbirds, but they can be distinguished by their structural features and habitat preferences. The Shag has a more slender build with a thinner bill, while the Double-crested Cormorant is bulkier with a thicker, hooked bill. Observing their behavior and preferred environments can also aid in identification.

Identification tips

1. Bill Shape: Look for the European Shag's thinner, more pointed bill compared to the thicker, hooked bill of the Double-crested Cormorant. 2. Plumage Gloss: Note the Shag's greenish sheen during breeding season. 3. Habitat: Consider the location; Shags prefer rocky coasts, while Double-crested Cormorants are more adaptable. 4. Behavior: Observe for wing-spreading behavior common in Double-crested Cormorants.

Size

The Double-crested Cormorant is generally larger and bulkier than the European Shag.

Plumage

The European Shag often appears more glossy with a greenish sheen, especially during the breeding season, while the Double-crested Cormorant is more uniformly dark with a less glossy appearance. The Shag lacks the Double-crested Cormorant's distinctive breeding crests.

Behaviour

Both species dive for fish, but the European Shag tends to be more agile and faster underwater. The Double-crested Cormorant often perches with wings spread to dry.

Habitat

European Shags are typically found along rocky coastlines and islands, while Double-crested Cormorants are more versatile, inhabiting both coastal and inland waters, including lakes and rivers.

Voice

Vocalizations are not a reliable distinguishing feature in the field as both species are relatively quiet and have similar guttural calls.