Collocalia linchi
Silhouette: Aviceda (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~70% in a week ~90%
The cave swiftlet or linchi swiftlet (Collocalia linchi) is a species of swift in the family Apodidae. It is found on the Indonesia islands of Sumatra, Java and Bali. It is a woodland species and nests in caves. The Bornean swiftlet was considered a subspecies, but is now usually considered distinct.
The cave swiftlet was described by the naturalists Thomas Horsfield and Frederic Moore in 1854 under the present binomial name Collocalia linchi. The specific epithet linchi is the Javanese word for a swiftlet. There are four recognised subspecies:
This bird is shiny blackish-brown above with a greenish gloss, including its rump; sometimes looks black and hooded. Chest black; belly to flanks pale grey with fine black speckles at margins. Wing tips are rounded; underwing is black. Tail black, rounded with shallow notch but lacking the white specks found in the very similar glossy swiftlet... Wikipedia →
Call1:08
Indonesia · 2001
© Jelle Scharringa · XC777099 · CC BY-NC-SA 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bali Barat National Park | 🇮🇩 Indonesia |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yogyakarta | 🇮🇩 Indonesia | |
| 2 | Jakarta | 🇮🇩 Indonesia | |
| 3 | Denpasar | 🇮🇩 Indonesia | |
| 4 | Tasikmalaya | 🇮🇩 Indonesia | |
| 5 | Malang | 🇮🇩 Indonesia | |
| 6 | Semarang | 🇮🇩 Indonesia | |
| 7 | Bandung | 🇮🇩 Indonesia | |
| 8 | Surabaya | 🇮🇩 Indonesia |
Possible
About 30% of wildlife watchers report a Cave Swiftlet sighting in Surabaya on a given day, based on 41 verified sightings from GBIF citizen-science data. It is the 2nd most-seen of the 27 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.
October
In that month about 60% of wildlife watchers report a Cave Swiftlet in Surabaya on a given day, against about 20% in July, the lowest month. That is one of Surabaya's driest months, with about 60 mm of rain against 330 mm in January. April and June have too few records to rate.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Cave Swiftlet sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
8th of 8
Of the 8 cities where we can rate Cave Swiftlet sightings, Surabaya ranks 8th at about 30%. The best odds are in Yogyakarta (Indonesia, about 90%), Jakarta (Indonesia, about 90%) and Denpasar (Indonesia, about 80%).
GBIF citizen-science records
It is estimated from how often the Cave Swiftlet is recorded against all the birds logged in Surabaya (41 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.
