Bryan's Shearwater vs Tropical Shearwater

In short

Bryan's Shearwater and Tropical Shearwater can be challenging to differentiate due to their similar size and plumage. However, Bryan's Shearwater typically has a more contrasting black-and-white appearance, while Tropical Shearwater often appears more uniformly dark above. Observing their behavior and habitat can also provide clues.

Identification tips

1. Look for the more contrasting black-and-white plumage of Bryan's Shearwater. 2. Consider the geographic location; Bryan's Shearwater is usually found in the North Pacific, while Tropical Shearwater is more tropical. 3. Note the extent of white on the face and underparts, which is typically more pronounced in Bryan's Shearwater.

Size

Both species are small shearwaters, with similar body size and structure.

Plumage

Bryan's Shearwater generally exhibits a more contrasting black-and-white plumage, with a distinct white face and underparts, and a sharp demarcation between the dark upperparts and white underparts. Tropical Shearwater tends to have darker upperparts with less contrast, and the white on the face is less extensive.

Behaviour

Both species exhibit typical shearwater behavior, such as gliding low over the water and diving for prey. Specific behavioral differences are not well-documented.

Habitat

Bryan's Shearwater is often found in the North Pacific, while Tropical Shearwater is more widespread in tropical oceans, often near islands. Their ranges do not typically overlap, which can aid identification.

Voice

Vocalizations are not well-documented for field identification purposes, and both species are generally silent at sea.