Black-capped Petrel vs Bonin Petrel

In short

The Black-capped Petrel is distinguished by its dark cap and contrasting white face, while the Bonin Petrel has a more uniform appearance with a less distinct cap. Both species are similar in structure, but the Black-capped Petrel's striking head pattern is a key differentiator.

Identification tips

1. Look for the dark cap and white face of the Black-capped Petrel, which contrasts sharply. 2. Note the more uniform head coloration of the Bonin Petrel, lacking a distinct cap.

Plumage

The Black-capped Petrel features a prominent dark cap and a contrasting white face, which is more distinct than the Bonin Petrel's more uniform head coloration. The Bonin Petrel lacks the sharply defined cap, giving it a more uniform appearance.