Sooty Shearwater vs Bryan's Shearwater

The Sooty Shearwater (Ardenna grisea) and Bryan's Shearwater (Puffinus bryani) can be distinguished primarily by size and plumage. Sooty Shearwaters are larger with uniformly dark plumage, while Bryan's Shearwaters are smaller and feature contrasting dark upperparts and white underparts.

1. Size: Look for the larger size of the Sooty Shearwater. 2. Plumage: Note the uniform dark plumage of the Sooty Shearwater versus the contrasting dark and white of Bryan's Shearwater. 3. Group Size: Sooty Shearwaters may be seen in larger groups. 4. Location: Consider the range and typical habitats, with Sooty Shearwaters being more widespread.

Sooty Shearwaters are significantly larger than Bryan's Shearwaters, making size a useful field mark when both species are observed together.

Sooty Shearwaters have a uniform dark brown to sooty plumage, whereas Bryan's Shearwaters display a stark contrast with dark upperparts and white underparts.

Both species exhibit similar flight patterns typical of shearwaters, with long glides and few wingbeats, but Sooty Shearwaters may be seen in larger flocks.

Sooty Shearwaters are often seen in open ocean environments and along coastlines, while Bryan's Shearwaters have a more restricted range, often associated with specific breeding islands.

Vocalizations are not well-documented for either species in field conditions, and thus are not a reliable distinguishing feature.