From Opus

Apus acuticauda

[edit] Identification

Length 17cm. This species is only little known and a positive identification in field is difficult.

• Black above
• Underparts heavily scaled white, more than in any subspecies of Pacific Swift
• Black undertail coverts
• Throat sometimes darker, with a streaked impression
• Tail deeply forked, outer rectrix fine and sharply pointed

[edit] Similar Species

The size is about the same as Common Swift, the structure similar to Pacific Swift.

[edit] Distribution

Breeds very locally in NE India. Recent record from Bhutan and one record in Myanmar. Winters probably in N Thailand, but records from there may also represent an unknown breeding population.
Known breeding place around Lilancote and Cherrapunji in the Khasi Hills. Thought to also breed in Lushai Hills in Mizoram.
Restricted range species with a very small population. Vulnerable, but more study needed to get more information about range and population.

[edit] Taxonomy

Forms a superspecies with Pacific Swift and was also considered to be a subspecies of it.
Regarded as monotypic, but birds from Thailand may represent a distinctive subspecies. Described subspecies rupchandi usually not accepted.

[edit] Habitat

Found around cliffs and deep gullies. The Khasi and Lushai Hills are in a very wet zone with over 11m of precipitation per year.

[edit] Behaviour

No information about food and feeding or behaviour.
Breeds colonially in spring from February to May on ledges and fissures in cliffs. Builds a cup-like nest, using grass and feathers which are agglutinated with saliva. Lays 2-3, sometimes 4 eggs.
The records in Thailand suggest migration, but further study needed.

[edit] External Links

• View more images of this species on Orientalbirdimages