Black Guillemot vs Pigeon Guillemot

In short

Black Guillemots and Pigeon Guillemots are similar in structure but can be distinguished by their plumage and habitat preferences. Black Guillemots have a more pronounced white wing patch, while Pigeon Guillemots have a subtler wing patch and are found in different geographical regions.

Identification tips

1. Look for the white wing patch: more pronounced in Black Guillemots. 2. Check the habitat: Black Guillemots are more Arctic, while Pigeon Guillemots are along the Pacific coast. 3. Observe plumage: Black Guillemots in nonbreeding plumage are mostly white with black wings, whereas Pigeon Guillemots are darker and more uniform.

Size

Both species are similar in size, typical of small alcids, with no significant difference noticeable in the field.

Plumage

Black Guillemots have a striking white wing patch that is more pronounced than the Pigeon Guillemot's. In nonbreeding plumage, Black Guillemots are mostly white with black wings, while Pigeon Guillemots have a darker, more uniform grayish body with a less distinct wing patch.

Behaviour

Both species forage by diving and are often seen close to shore. Black Guillemots are more likely to be seen near ice edges in the Arctic, while Pigeon Guillemots are found along rocky coastlines.

Habitat

Black Guillemots prefer colder, Arctic environments and are often found near ice edges. Pigeon Guillemots are more common along the Pacific coast of North America, favoring rocky shorelines and islands.

Voice

Both species have similar calls, consisting of high-pitched whistles and trills, but specific differences are not well-documented.