Hemiprocne longipennis
Silhouette: Sheatherius · PhyloPic
In 3 days ~70% in a week ~90%
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 |
Possible
About 30% of wildlife watchers report a Gray-rumped Treeswift sighting in Bali Barat National Park on a given day, based on 321 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 35th most-seen of the 173 birds we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
May
In that month about 50% of wildlife watchers report a Gray-rumped Treeswift in Bali Barat National Park on a given day, against about 30% in January–February, June–July and September–November, the lowest months. That is one of Bali Barat National Park's driest months, with about 75 mm of rain against 280 mm in February.
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.
Yes
Of the 13 parks where we can rate Gray-rumped Treeswift sightings, Bali Barat National Park has the highest daily chance: about 30%. Next come Tangkoko Nature Reserve (Indonesia, about 30%) and Gunung Leuser National Park (Indonesia, about 30%).
Same order: Apodiformes
The closest relatives of the Gray-rumped Treeswift that you can see in Bali Barat National Park (order Apodiformes, Swifts and Hummingbirds) are Cave Swiftlet (about 70%), White-nest Swiftlet (about 40%) and House Swift (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Gray-rumped Treeswift is recorded against all the birds logged in Bali Barat National Park (321 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.
