Soft-plumaged Petrel vs Blue Petrel

In short

The Soft-plumaged Petrel and Blue Petrel can be differentiated by their distinct facial patterns and underwing markings. The Soft-plumaged Petrel typically has a more uniform dark cap and a contrasting white face, while the Blue Petrel features a distinctive white eyebrow and a more prominent dark cap. Underwing patterns are also key, with the Blue Petrel showing a more defined dark trailing edge.

Identification tips

1. Look for the white eyebrow and more prominent dark cap of the Blue Petrel. 2. Check the underwing pattern: Blue Petrel has a more defined dark trailing edge. 3. Observe the facial pattern: Soft-plumaged Petrel has a more uniform dark cap with a contrasting white face. 4. Consider the habitat: Blue Petrel is more likely in subantarctic waters.

Size

Both species are similar in size, but the Blue Petrel is slightly smaller and more compact.

Plumage

The Soft-plumaged Petrel has a dark cap with a contrasting white face and throat, while the Blue Petrel is characterized by a white eyebrow and a more prominent dark cap. The Blue Petrel also has a distinctive dark 'M' pattern across the upper wings and back. Underwings of the Blue Petrel show a more defined dark trailing edge compared to the Soft-plumaged Petrel.

Behaviour

Both species exhibit similar flight patterns typical of petrels, with graceful gliding and occasional flapping.

Habitat

Both species are pelagic and are typically found in open ocean waters, but the Blue Petrel is more often associated with subantarctic waters.

Voice

Vocalizations are not a reliable field mark as both species are generally silent at sea.