From Opus

Aerodramus rogersi

[edit] Identification

A large swiftlet (13cm) with forked tail, dark brown upperparts, greyish rump, and underparts uniform pale grey.

[edit] Similar Species

In hand: lacking white rami and tarsus feathering of similar Himalayan Swiftlet.

[edit] Distribution

Breeds in W Thailand, N Laos and E Myanmar. Wintering also in Southern Indochina to S Thailand.
Common in most of its range.

[edit] Taxonomy

Accepted as full species by Clements and Sibley and Monroe. Howard and Moore treat it as a subspecies of Himalayan Swiftlet (like Volcano Swiftlet). May be closely related to Indian Swiftlet.
Like other Aerodramus Swiftles this species is often placed in Collocalia.
Monotypic.

[edit] Habitat

Mountain forest, prefers wooded river valleys.

[edit] Behaviour

Feeds on insects, taken in flight. Foraging often in groups.
Colonial breeder on cliffs or inside caves. Capable of echolocation. Bracket-shaped nest of vegetable matter hold together with saliva. Lays two eggs.
Probably a partial migrant, but identification difficulties lead to lack of information about migration pattern.

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