Great Shearwater vs Sargasso Shearwater

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.