pardela-de-barrete vs pardela-de-asa-larga

The Great Shearwater and Sargasso Shearwater can be distinguished by their plumage and breeding locations. The Great Shearwater is notable for its dark cap and brown belly-patch, whereas the Sargasso Shearwater lacks these distinctive marks.

Look for the dark cap and brown belly-patch on the Great Shearwater. These features are absent in the Sargasso Shearwater.

The Great Shearwater has a dark cap and a brown belly-patch, with a white underwing that may have variable brown markings. The Sargasso Shearwater does not have these specific features.