Grey-faced Petrel vs Blue Petrel

The Grey-faced Petrel and Blue Petrel can be distinguished primarily by their facial coloration and wing patterns. The Grey-faced Petrel has a distinctive grey face, while the Blue Petrel features a more uniform blue-grey plumage with a striking white underbelly and a dark 'M' pattern across the upper wings.

Look for the grey face on the Grey-faced Petrel, which contrasts with the more uniform blue-grey and white plumage of the Blue Petrel. The Blue Petrel's dark 'M' pattern on the wings is also a key distinguishing feature.

The Grey-faced Petrel has a grey face and darker overall plumage, whereas the Blue Petrel is characterized by its blue-grey upperparts, white underparts, and a distinctive dark 'M' pattern across the wings.