Introduction
The Drab Swiftlet, Collocalia neglecta, is a small swift in the family Apodidae. It is associated with the Lesser Sunda Islands of Indonesia and Timor, where it occurs in a range of habitats from dry lowland areas to upland forest. The species was formerly treated as a form of the Glossy Swiftlet, and some taxonomic authorities continue to differ in their treatment.
Physical Description
The Drab Swiftlet is a small, compact bird with a streamlined body and long, narrow, pointed wings. It is approximately 10 centimetres long, although published measurements vary between populations and taxonomic treatments.
The upperparts are dark satin grey, greyish-blue or brownish-grey, with a subtle sheen on the crown and tail. The throat and upper breast are darker grey, while the lower breast, belly and flanks are paler, often approaching white. The rump and under-tail area are darker, and the tail is relatively short and square-ended rather than deeply forked. Pale markings on the inner webs of the outer tail feathers can be useful at close range.
There is little evidence of obvious sexual dimorphism. Geographic variation is more apparent, with some island forms, including C. n. perneglecta, described as darker and more glossy than the nominate form.
Range and Habitat
The Drab Swiftlet is restricted to the Lesser Sunda region. The nominate subspecies, C. n. neglecta, is associated mainly with Timor and nearby islands such as Rote, Sawu and Semau. The subspecies C. n. perneglecta occurs farther east, including Alor, Wetar and Kisar. Records from some other islands have been affected by taxonomic uncertainty and possible intergradation with the Glossy Swiftlet.
It is a resident rather than a long-distance migrant. The species uses open country, dry forest, woodland, villages and coastal areas, and may forage over both lowlands and uplands. Limestone cliffs, rock faces, caves and buildings can provide suitable roosting or nesting surfaces, although the species is not restricted to large cave systems.
Where to See This Species
Camplong Nature Recreation Park, East Nusa Tenggara, Indonesia
Camplong is a publicly accessible conservation and nature-tourism area on Timor, with seasonal forest, savanna and rocky features. Birding records have reported the Drab Swiftlet, formerly recorded as the neglecta form of the Glossy Swiftlet, in and around Camplong. Look overhead in open areas, around forest edges and near cliffs or other vertical surfaces, especially during the drier season when flying insects are active.
Nearby accommodation: Kupang is the most practical accommodation base, with hotels, guest houses and self-catering options, while simpler local accommodation may be available nearer the park.
Mount Mutis, East Nusa Tenggara, Indonesia
The Mount Mutis area provides upland forest and open mountain habitat on Timor. Birding reports have recorded the Drab Swiftlet from the wider Mount Mutis region, including elevations approaching 1,900 metres. Search above forest clearings, ridgelines, roads and village edges, where swiftlets may gather to feed.
Nearby accommodation: Fatumnasi and Soe are the main local bases, with homestays, guest houses and basic rural accommodation available in the wider area.
Tasitolu Protected Area, Dili Municipality, Timor-Leste
Tasitolu is a publicly accessible protected coastal area west of Dili, containing wetlands, savanna woodland and dry forest. A biodiversity assessment for the area recorded the Drab Swiftlet, although older local records may have used the name Glossy Swiftlet because of earlier taxonomy. The species may be seen flying over open ground, woodland edges and coastal slopes.
Nearby accommodation: Dili is the practical base, with hotels, guest houses and serviced apartments suitable for visiting the protected area.
Behaviour and Diet
The Drab Swiftlet spends much of its time in flight and usually feeds by hawking small flying insects from the air. Its diet is expected to include a mixture of small airborne insects and other arthropods, although detailed species-specific dietary studies are limited.
It may forage alone, in pairs or in loose groups, sometimes joining other swiftlets over productive feeding areas. Flight is fast and direct, with frequent banking and rapid changes of direction. Birds may fly low over open ground or higher above forest and hills depending on local conditions.
Nesting information for the Drab Swiftlet is limited. Like other small swiftlets, it may attach a shallow nest to a sheltered vertical surface, using plant material and salivary secretions. Available information is insufficient to confirm a consistent clutch size or breeding season across its range. The species should not automatically be associated with the commercially harvested edible nests of other swiftlets.
Unlike some swiftlets in the genus Aerodramus, the Drab Swiftlet should not be assumed to use sophisticated echolocation. Dark-cave navigation and echolocation are not established as defining features of this species.
Identification Tips
- Look for a small, swift-flying bird with long pointed wings and a short, square-ended tail.
- Note the contrast between the dark grey or greyish-brown upperparts and the paler lower breast and belly.
- A dark rump and subtle pale markings on the inner webs of the outer tail feathers can help at close range.
- The bird is generally less obviously glossy than the Glossy Swiftlet, although lighting, distance and geographical variation can make this distinction unreliable.
- Identification is safest when the location is considered alongside plumage, because several Lesser Sunda swiftlets can appear similar in flight.
- Do not rely on a deeply forked tail, as the Drab Swiftlet normally has a relatively square tail.
Conservation Status
A separate current IUCN Red List category for Collocalia neglecta was not verified for this species treatment. Some conservation databases continue to include the taxon within the Glossy Swiftlet, while others recognise the Drab Swiftlet as a full species. A standalone population estimate or reliable population trend should therefore not be stated without a source that explicitly assesses C. neglecta.
Potential pressures include the loss and fragmentation of dry forest, disturbance of caves and cliffs, quarrying, uncontrolled tourism and changes to insect-rich feeding habitats. Protection of remaining forest, responsible management of caves and cliffs, and monitoring of island populations would help clarify the species’ status and support its conservation.
Frequently Asked Questions
Where is the Drab Swiftlet found?
The Drab Swiftlet is associated with the Lesser Sunda Islands, particularly Timor and nearby islands including Rote, Sawu, Semau, Alor, Wetar and Kisar. Its exact range varies between taxonomic sources.
Is the Drab Swiftlet endemic to Timor?
No. Timor is an important part of its range and the type locality, but the species is also reported from several other islands in the Lesser Sunda region.
What does the Drab Swiftlet eat?
It is primarily insectivorous and catches small flying insects and other airborne arthropods while in flight.
Does the Drab Swiftlet use echolocation?
Echolocation is not established as a characteristic of the Drab Swiftlet. It should not be confused with certain Aerodramus swiftlets that use clicking calls for navigation in darkness.
How can the Drab Swiftlet be identified?
Look for a small swift with dark grey or greyish-brown upperparts, paler underparts, a dark rump, long pointed wings and a short, fairly square tail. Geographic context is important because similar swiftlets occur in the region.
Is the Drab Swiftlet endangered?
Its separate conservation status is unclear because taxonomic authorities do not all treat it independently from the Glossy Swiftlet. Habitat protection is nevertheless important, particularly on small islands where forest and cave habitats may be vulnerable to disturbance.
References
- IOC World Bird List
- Cornell Lab of Ornithology, Birds of the World
- Asian Development Bank
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