Hemiprocne longipennis
Silhouette: Sheatherius · PhyloPic
In 3 days ~40% in a week ~70%
The grey-rumped treeswift (Hemiprocne longipennis) is a species of bird in the Hemiprocnidae family. Currently, four extant species are placed in the family. Like the other members of the Hemiprocnidae, this species is closely related to true swifts, but unlike true swifts, the treeswifts are arboreal, often seen perched on trees, high-tension power transmission lines, and pylons. When perched, the wing tips cross over the tail. This species is commonly found in peninsular Malaysia, but has an extremely large range; there is limited information about population trends.
Adult males have a distinct dark grey throat and chest contrasting with a white belly. Ear coverts are dull orange-red/chestnut-colored. Adult females lack the dull orange-red/chestnut coloration on the ear coverts. When perched, the wing tips cross over across the tail. Both sexes have a greenish sheen to the upper parts.
It is found in Brunei, Indonesia, Malaysia, Myanmar, the Philippines, Singapore, and Thailand. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical mangrove forests, and subtropical or tropical moist montane forests.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bali Barat National Park | 🇮🇩 Indonesia | |
| 2 | Tangkoko Nature Reserve | 🇮🇩 Indonesia | |
| 3 | Gunung Leuser National Park | 🇮🇩 Indonesia | |
| 4 | Khao Luang National Park | 🇹🇭 Thailand | |
| 5 | Sepilok | 🇲🇾 Malaysia | |
| 6 | Way Kambas National Park | 🇮🇩 Indonesia | |
| 7 | Danum Valley Conservation Area | 🇲🇾 Malaysia | |
| 8 | Taman Negara National Park | 🇲🇾 Malaysia | |
| 9 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 10 | Tanjung Puting National Park | 🇮🇩 Indonesia | |
| 11 | Khao Sok National Park | 🇹🇭 Thailand | |
| 12 | Kinabalu Park | 🇲🇾 Malaysia | |
| 13 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kuching | 🇲🇾 Malaysia | |
| 2 | Kuala Lumpur | 🇲🇾 Malaysia | |
| 3 | Singapore | 🇸🇬 Singapore |
With luck
About 10% of wildlife watchers report a Gray-rumped Treeswift sighting in Kaeng Krachan National Park on a given day, based on 613 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 106th most-seen of the 360 birds we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
January–February and April
In those months about 20% of wildlife watchers report a Gray-rumped Treeswift in Kaeng Krachan National Park on a given day, against about 10% in March and May–December, the lowest months. Those are among Kaeng Krachan National Park's driest months, with about 65 mm of rain a month against 260 mm in September.
Between 2 and 5 am
Across all the parks we cover, that three-hour window holds the most Gray-rumped Treeswift sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
9th of 13
Of the 13 parks where we can rate Gray-rumped Treeswift sightings, Kaeng Krachan National Park ranks 9th at about 10%. The best odds are in Bali Barat National Park (Indonesia, about 30%), Tangkoko Nature Reserve (Indonesia, about 30%) and Gunung Leuser National Park (Indonesia, about 30%).
GBIF citizen-science records
It is estimated from how often the Gray-rumped Treeswift is recorded against all the birds logged in Kaeng Krachan National Park (613 verified sightings from 2019 to 2026), 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.
