Pétrel du Herald vs Pétrel à ailes noires

The Herald Petrel and Black-winged Petrel can be distinguished primarily by their wing coloration and structure. The Herald Petrel typically has a more uniform wing coloration, while the Black-winged Petrel shows distinct black markings on its wings.

Look for the black markings on the wings to identify the Black-winged Petrel. In contrast, the Herald Petrel will have more uniform wing coloration.

The Herald Petrel generally has a more uniform wing coloration, whereas the Black-winged Petrel is characterized by its distinct black markings on the wings.