Socotragierzwaluw Apus berliozi

Brownish, mid-sized swift with powerful, direct flight. The wings are uniform, without significantly contrasting paler patches on the inside of the wings. Nest in caves and crevices, but can be seen in flight over many habitats, especially dry, montane areas. The call is a moderately-pitched descending trill. Very similar to Pallid and Common Swift, and separation is difficult in times and places where they overlap. Slightly darker than Pallid Swift and paler than Common Swift, with subtly different vocalizations. Also similar to African and Nyanza Swifts, but can be separated by the uniform wings without contrastingly pale panels at the base.