Sooty Shearwater vs Yelkouan Shearwater

The Sooty Shearwater and Yelkouan Shearwater can be distinguished by their overall coloration and structure. The Sooty Shearwater is uniformly dark, while the Yelkouan Shearwater has a more contrasting plumage with lighter underparts. Structural differences, such as bill shape and size, are subtle but can aid identification.

Look for overall coloration: Sooty Shearwater is uniformly dark, while Yelkouan Shearwater shows contrast between dark upperparts and light underparts. Check structural cues: Though subtle, differences in bill shape and size can assist in identification.

Sooty Shearwater is uniformly dark, appearing sooty or chocolate brown all over. In contrast, the Yelkouan Shearwater has a more contrasting appearance with darker upperparts and lighter, whitish underparts.