Yelkouan Shearwater vs Balearic Shearwater

In short

The Yelkouan Shearwater and Balearic Shearwater are similar in appearance but can be distinguished by their plumage and subtle structural differences. The Yelkouan typically has a more contrasting dark upperparts and white underparts, while the Balearic appears browner overall with less contrast.

Identification tips

1. Look for the more contrasting plumage of the Yelkouan Shearwater, especially the stark white underparts. 2. Note the overall brownish tone of the Balearic Shearwater. 3. Consider the geographic location, as Yelkouan is more eastern and Balearic more western in the Mediterranean. 4. Observe the flight style, although both are similar, context and location can aid identification.

Size

Both species are similar in size, with no significant difference noticeable in the field.

Plumage

Yelkouan Shearwater shows more contrasting dark upperparts and white underparts, whereas Balearic Shearwater tends to have a browner, more uniformly colored appearance with less contrast between upper and underparts.

Behaviour

Both species exhibit similar flight patterns, often flying low over the water with stiff wingbeats and glides.

Habitat

Yelkouan Shearwater is more commonly found in the eastern Mediterranean, while Balearic Shearwater is typically seen in the western Mediterranean and occasionally in the Atlantic.

Voice

Vocalizations are not a reliable field mark as both species have similar calls, often heard at breeding colonies rather than at sea.