Pardela Dorsigrís vs Pardela de Hutton

Buller's Shearwater and Hutton's Shearwater can be distinguished by their size and plumage. Buller's is larger and has a distinctive bold pattern on the upperparts, while Hutton's is smaller and more uniformly dark above.

Look for the bold black-and-white upperparts of Buller's Shearwater compared to the more uniformly dark upperparts of Hutton's Shearwater. Size can also be a clue, with Buller's being noticeably larger.

Buller's Shearwater is larger than Hutton's Shearwater.

Buller's Shearwater has a striking black-and-white pattern on the upperparts and a white underbody, while Hutton's Shearwater is more uniformly dark above with a less contrasting underbody.