Fea's Petrel vs Cory's Shearwater

Fea's Petrel and Cory's Shearwater can be distinguished primarily by their structure and plumage. Fea's Petrel is smaller and more compact, with a shorter bill and tail, while Cory's Shearwater is larger with a more elongated body and longer wings. Plumage differences include the darker upperparts of Fea's Petrel compared to the paler, more uniform upperparts of Cory's Shearwater.

Fea's Petrel: Look for a smaller, more compact body with darker upperparts. Cory's Shearwater: Note the larger size, elongated body, and paler upperparts.

Fea's Petrel is smaller and more compact compared to the larger and more elongated Cory's Shearwater.

Fea's Petrel has darker upperparts, whereas Cory's Shearwater has paler, more uniform upperparts.