Introduction
The Indian Swiftlet, also known as the Indian Edible-nest Swiftlet, is a small resident swift of the Western Ghats in south-western India and Sri Lanka. Its accepted scientific name is Aerodramus unicolor. It is adapted to fast, manoeuvrable flight, feeds mainly on flying insects and uses caves, tunnels and other sheltered vertical surfaces for roosting and nesting.
Physical Description
The Indian Swiftlet is approximately 12 centimetres long. It has a slender body, long, narrow, swept-back wings and a short tail with a shallow fork. The plumage is generally sooty brown or dark brown above, with somewhat paler brown underparts. The rump is usually only slightly paler than the back, which helps distinguish it from some similar swiftlets.
The sexes are alike in appearance. Juveniles may look slightly paler or less glossy than adults, but age-related differences are subtle and difficult to assess in fast-moving birds. As with other swifts, the legs are very short and are used mainly for clinging to vertical surfaces rather than walking on the ground.
Range and Habitat
The Indian Swiftlet is a resident species found in the Western Ghats of south-western India and throughout suitable parts of Sri Lanka. It is not an Andaman and Nicobar species, where other swiftlets occur.
It uses a range of habitats, including forested hills, woodland, open country and areas around settlements. Caves, rock shelters, railway tunnels, culverts and similar structures are important for roosting and breeding. The species may forage over forest canopy, valleys, farmland and open landscapes, often well away from its nesting site.
Its distribution is geographically restricted to the Indian subcontinent, but it can be locally common, especially in suitable upland areas of Sri Lanka and the Western Ghats.
Where to See This Species
Sinharaja Forest Reserve, Sabaragamuwa and Southern Provinces, Sri Lanka
The Indian Swiftlet is documented in the Sinharaja area, where forest edges, valleys and open airspace above the rainforest provide suitable foraging habitat. Look overhead during daylight, particularly around clearings and access tracks. The species may be easier to detect by its rapid flight and sharp calls than by prolonged views of plumage.
Nearby accommodation: Kudawa, Weddagala and Deniyaya provide guest houses, small lodges and other accommodation used by visitors to the reserve.
Horton Plains National Park, Central Province, Sri Lanka
Horton Plains is a recognised site for the Indian Swiftlet, particularly around open highland grassland, forest margins and valleys. Birds can often be watched as they pass over open areas, although strong winds, mist and changing weather can make observation difficult. Nuwara Eliya is a practical base for visiting the park.
Nearby accommodation: Nuwara Eliya offers hotels, guest houses, lodges and self-catering accommodation, while smaller accommodation is also available around the park approaches.
Periyar Tiger Reserve, Kerala, India
The Indian Swiftlet is recorded from the Periyar area of the southern Western Ghats. Forested hills, open clearings and valleys around the reserve provide suitable feeding habitat, and birds may be seen overhead during daytime wildlife walks or along accessible roads and viewpoints.
Nearby accommodation: Thekkady and Kumily are the main gateway settlements, with hotels, guest houses, lodges and other visitor accommodation.
Behaviour and Diet
Indian Swiftlets are active by day and spend much of their time in flight. They usually feed in groups, sometimes joining other swifts, and catch small flying insects from the air. They may forage at different heights, from above the forest canopy to lower levels around clearings and valleys.
The species is social and commonly roosts or breeds in colonies. Like other Aerodramus swiftlets, it can use simple echolocation to help navigate in dark roosting and nesting spaces. Its high-pitched calls also help maintain contact between birds in flight and around colonies.
The nest is a small cup attached to a vertical surface or overhanging ledge. Saliva is an important binding material, often combined with feathers, moss or other fine fibrous material. Suitable sites may include caves, tunnels, culverts and rock shelters. Breeding information varies between localities, but nesting is associated with periods when flying insect prey is readily available. Clutches commonly contain two eggs, and both adults care for the young.
Identification Tips
- Look for a small, dark swift with long, narrow wings and a shallowly forked tail.
- The overall impression is sooty or dark brown rather than glossy black.
- The rump is not strongly contrasting with the back, unlike some other edible-nest swiftlets.
- The flight is fast, direct and agile, with frequent changes of direction while the bird feeds.
- The bird is most reliably identified by its combination of range, shape, plumage and flight behaviour, because views are often brief.
- In the Western Ghats and Sri Lanka, the species is less likely to be confused with the Himalayan Swiftlet because their regular ranges are largely separate. The Asian Palm Swift has a more conspicuously forked tail and a different, more buoyant flight style.
Conservation Status
The Indian Swiftlet is currently assessed as Least Concern globally. This category does not mean that every local population is secure. The species depends on suitable roosting and nesting sites, and local colonies may be affected by disturbance, loss of cave habitat and the collection of nests.
Nest harvesting can be particularly damaging where it is intensive or poorly regulated, because repeated disturbance may reduce breeding success. Protecting caves, tunnels and other nesting structures, regulating collection, and maintaining suitable forest and open foraging habitat are important conservation measures. Available Indian monitoring indicates concern about longer-term change, although the overall population trend is not considered sufficiently certain to support a more threatened global category.
Frequently Asked Questions
Where is the Indian Swiftlet found?
It occurs in the Western Ghats of south-western India and in Sri Lanka. It is a resident species rather than a long-distance migrant.
What does the Indian Swiftlet eat?
Its diet consists mainly of small flying insects caught in the air. It usually feeds during daylight, often in flocks or mixed groups with other swifts.
Does the Indian Swiftlet use caves?
Yes. Caves and other dark, sheltered structures are used for roosting and nesting. Railway tunnels, culverts, rock shelters and similar sites may also be used.
Can the Indian Swiftlet echolocate?
Yes. As an Aerodramus swiftlet, it can produce simple echolocation calls that help it navigate in dark roosting and nesting places.
How can the Indian Swiftlet be identified in flight?
Look for a small, dark brown swift with long, narrow wings, a short shallowly forked tail and rapid, agile flight. The species is often best identified by combining its appearance with its location and habitat.
Is the Indian Swiftlet endangered?
It is currently assessed as Least Concern globally. Local colonies can nevertheless be vulnerable to nest harvesting, disturbance and the loss of suitable nesting sites.
References
- BirdLife International
- IOC World Bird List
- State of India’s Birds
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