Berta di Bulwer vs Flesh-footed Shearwater

Bulwer's Petrel and Flesh-footed Shearwater can be distinguished primarily by size and coloration. Bulwer's Petrel is smaller and uniformly dark, while the Flesh-footed Shearwater is larger with a distinct pale bill and pinkish feet.

Size: Bulwer's Petrel is smaller. Coloration: Look for the Flesh-footed Shearwater's pale bill and pinkish feet, contrasting with Bulwer's Petrel's uniform dark plumage.

Bulwer's Petrel is significantly smaller than the Flesh-footed Shearwater.

Bulwer's Petrel is uniformly dark brown, whereas the Flesh-footed Shearwater has a darker body with a pale bill and pinkish feet.