Manx Shearwater vs Balearic Shearwater

In short

The Manx Shearwater and Balearic Shearwater are two closely related species that can be challenging to distinguish in the field. Key differences include plumage coloration and subtle structural features. Observing these birds in their typical habitats and noting their behavior can also aid in identification.

Identification tips

1. Plumage contrast: Look for the stark black-and-white contrast of the Manx Shearwater versus the more uniform brownish tones of the Balearic Shearwater. 2. Habitat preference: Consider the location; Balearic Shearwaters are more coastal. 3. Seasonal presence: Note the time of year, as Manx Shearwaters migrate across the Atlantic, while Balearic Shearwaters are more resident in the Mediterranean.

Size

Both species are similar in size, but the Balearic Shearwater may appear slightly bulkier.

Plumage

The Manx Shearwater has a striking contrast between its dark upperparts and white underparts, while the Balearic Shearwater has a more uniform brownish tone overall, with less contrast between the upper and lower parts.

Behaviour

Both species exhibit similar foraging behaviors, often seen gliding low over the water. However, the Balearic Shearwater may be more likely to be seen closer to shore.

Habitat

The Manx Shearwater is typically found in the North Atlantic, often far from land, while the Balearic Shearwater is more coastal, frequenting the Mediterranean and nearby Atlantic waters.

Voice

Vocalizations are not a reliable field mark for distinguishing these species as they are rarely heard at sea.