Aerodramus brevirostris
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In 3 days <5% in a week ~10%
The Himalayan swiftlet (Aerodramus brevirostris) is a small swift. It is a common colonial breeder in the Himalayas and Southeast Asia. Some populations are migratory. This swiftlet was formerly placed in the genus Collocalia. Two of its five subspecies are frequently given full species status, A. b. rogersi as the Indochinese swiftlet, Aerodramus rogersi, and the isolated Javan form A. b. vulcanorum as the Volcano swiftlet, Aerodramus vulcanorum.
This 13–14 cm long swiftlet has swept-back wings that resemble a crescent or a boomerang. The body is slender, and the tail is forked. It is, in many respects, a typical swift, having narrow wings for fast flight, and a wide gape and small beak surrounded by bristles for catching insects in flight. Its legs are very short, preventing the bird from perching, but allowing it to cling to vertical surfaces.
It is mainly grey-brown above and paler brown below. It has a pale grey rump and a pale patch above and behind the bill. The sexes are similar, but the juvenile has a less distinct rump. There are five subspecies, differing mainly in the rump tone.
A. b. brevirostris breeds in the Himalayas east to Bangladesh, Myanmar... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Yai National Park | 🇹🇭 Thailand | |
| 2 | Namdapha National Park | 🇮🇳 India | |
| 3 | Langtang National Park | 🇳🇵 Nepal | |
| 4 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 5 | Royal Manas National Park | 🇧🇹 Bhutan | |
| 6 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 7 | Jiuzhaigou National Park | 🇨🇳 China | |
| 8 | Jim Corbett National Park | 🇮🇳 India | |
| 9 | Royal Bardia National Park | 🇳🇵 Nepal | |
| 10 | Manas National Park | 🇮🇳 India | |
| 11 | Chitwan National Park | 🇳🇵 Nepal | |
| 12 | Kaziranga National Park | 🇮🇳 India |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chengdu | 🇨🇳 China | |
| 2 | Dhaka | 🇧🇩 Bangladesh | |
| 3 | Kathmandu | 🇳🇵 Nepal | |
| 4 | Dehradun | 🇮🇳 India | |
| 5 | Phnom Penh | 🇰🇭 Cambodia |
Rare
Under 5% of wildlife watchers report a Himalayan Swiftlet sighting in Dhaka on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 138th most-seen of the 185 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Himalayan Swiftlet in Dhaka on a given day, so our monthly data shows no clear season.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Himalayan Swiftlet sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 5 cities where we can rate Himalayan Swiftlet sightings, Dhaka ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Chengdu (China, under 5%).
Same family: Apodidae
The closest relatives of the Himalayan Swiftlet that you can see in Dhaka (family Apodidae, Swifts) are Asian Palm-Swift (about 50%) and House Swift (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Himalayan Swiftlet is recorded against all the birds logged in Dhaka (15 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
