Bryan's Shearwater vs Black-vented Shearwater

In short

Bryan's Shearwater and Black-vented Shearwater can be challenging to distinguish at sea. Bryan's Shearwater is smaller with a more delicate structure, while Black-vented Shearwater is slightly larger and more robust. Key differences include bill size and plumage tone.

Identification tips

1. Look for the smaller size and more delicate structure of Bryan's Shearwater. 2. Note the whiter underbody and contrasting dark cap of Bryan's Shearwater. 3. Observe the more uniform dark upperparts of Black-vented Shearwater. 4. Consider geographic location, as ranges may overlap but have distinct preferences.

Size

Bryan's Shearwater is smaller and more delicate compared to the slightly larger and more robust Black-vented Shearwater.

Plumage

Bryan's Shearwater typically has a whiter underbody and a more contrasting dark cap. Black-vented Shearwater shows a more uniform dark upperpart and less contrast between the cap and the rest of the head.

Behaviour

Both species exhibit similar flight patterns typical of shearwaters, with gliding and flapping close to the water surface.

Habitat

Bryan's Shearwater is often found in the North Pacific, while Black-vented Shearwater is more commonly seen along the Pacific coast of North America.

Voice

Vocalizations are not well-documented for field identification and may not be reliable for distinguishing these species.