Uniform swiftlet

The uniform swiftlet, also known as the Vanikoro swiftlet or lowland swiftlet, is a gregarious, medium-sized swiftlet with a shallowly forked tail. The colouring is dark grey-brown, darker on the upperparts with somewhat paler underparts, especially on chin and throat. This species is widespread from the Philippines through Wallacea, New Guinea and Melanesia. It forages for flying insects primarily in lowland forests and open areas. It nests in caves where it uses its sense of echolocation, rare in birds, to navigate.

Taxonomy

The uniform swift was formally described in 1832 by the French naturalists Jean Quoy and Joseph Gaimard from a specimen collected on the island of Vanikoro in the Solomon Islands. They coined the binomial name Hirundo vanikorensis. This swiftlet is now placed in the genus Aerodramus that was introduced in 1906 by Harry C. Oberholser.
Twelve subspecies are recognised:

A. v. aenigma – north, central, southeast Sulawesi, Banggai Islands and Sula Islands is.
A. v. heinrichi – south Sulawesi
A. v. moluccarum – central, south Moluccas
A. v. waigeuensis – north Moluccas and Raja Ampat Islands
A. v. steini – Numfor and Biak
A. v. yorki – Aru Islands, Yapen and New Guinea
A. v. tagulae – D'Entrecasteaux Archipelago, Louisiade Archipelago, Trobriand Islands and Woodlark Island
A. v. coultasi – Admiralty Islands and St Matthias Islands
A. v. pallens – New Hanover Island, New Ireland and Dyaul and New Britain
A. v. lihirensis – islands northeast of New Ireland
A. v. lugubris – Buka to Rennell Island and Makira
A. v. vanikorensis – Temotu and Vanuatu
Description

The uniform swiftlet is a gregarious, medium-sized swiftlet with a shallowly forked tail. It is about 13 cm long with a wingspan averaging around 27 cm. It weighs about 11 grams. The colouring is dark grey-brown, darker on the upperparts with paler underparts, especially on chin and throat. It is similar to, and most likely to be confused with, the white-rumped swiftlet or mountain swiftlet.

Distribution and habitat

This species is widespread from the Philippines through Wallacea, New Guinea and Melanesia. It has been recorded as a rare vagrant to Australia, from Cape York Peninsula and islands in Torres Strait.
The uniform swiftlet forages over lowland forests and open areas. It roosts in caves and sinkholes, mostly in limestone areas. The caves may be as little as long but are usually much larger. Sometimes man-made tunnels or structures are used.

Behaviour

Food and feeding

This species feeds on flying insects, especially ants.

Breeding

This species nests colonially in caves where it uses echolocation to navigate. The nest is a shallow cup of mossy material and saliva, usually attached to a vertical surface of a cave wall in the completely dark zone. On Guam, Neckeropsis lepiniana, is used as the nesting material and in Hawaii, a liverwort is used. One or two white eggs form the clutch. The incubation period is at least twelve days and the young may take thirty-five days to fledge.

Status

The uniform swiftlet has a very large range and that they are locally common and in some places abundant within that range. The population has not been quantified but is believed to be stable. The birds face no particular threats, and as a result, the IUCN has listed it as being of "Least Concern".