Barolo Shearwater vs Sargasso Shearwater

In short

Barolo Shearwater and Sargasso Shearwater are closely related and challenging to distinguish at sea. Both species share similar plumage and structure, but subtle differences in size and regional distribution can aid identification.

Identification tips

1. Region: Consider the geographic location; Barolo Shearwater is more likely in the North Atlantic, while Sargasso Shearwater is found in the eastern Atlantic and Caribbean. 2. Size: Barolo Shearwater is slightly smaller and more compact. 3. Plumage: Be cautious; plumage differences are subtle and unreliable.

Size

Barolo Shearwater is slightly smaller and more compact than Sargasso Shearwater.

Plumage

Both species exhibit similar plumage with dark upperparts and white underparts. Differences are subtle and not reliable for field identification.

Behaviour

Both species are pelagic and often seen in loose colonies. Behavior at sea is similar, making it difficult to distinguish them based on behavior alone.

Habitat

Barolo Shearwater is found in the North Atlantic, particularly around the Azores and Canary Islands, while Sargasso Shearwater is endemic to the eastern Atlantic and Caribbean.