Collocalia isonota
In 3 days >90%
The ridgetop swiftlet (Collocalia isonota) is a small bird in the swift family Apodidae. It is endemic to the Philippines where it is found on Luzon, Mindanao and the Sulu Archipelago. Its natural habitat is tropical moist lowland forests. It was previously considered a subspecies of the glossy swiftlet.
The ridgetop swiftlet is 9–10 cm (3.5–3.9 in) in length with a square tail. The back and upper surface of the wings are a dark dull blue with a moderate green gloss. The rump is sometimes slightly paler due to the white margins of feathers forming the uppertail coverts. The throat and upper breast are dark grey with fine white scalloping merging into larger greyish chevrons over the lower breast and flanks, becoming white over the belly. There is sometimes a tuft of small feathers on the hallux, the rear facing toe. This species lacks the white spots on the inner webs of the tail feathers that are present in some Collocalia species.
The ridgetop swiftlet was described by the American ornithologist Harry Oberholser in 1906 as a subspecies of the cave swiftlet with the trinomial name Collocalia linchi isonota. The type locality is the province of Benguet... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Davao City | 🇵🇭 Philippines |
Very likely
About 70% of wildlife watchers report a Ridgetop Swiftlet sighting in Davao City on a given day, based on 121 verified sightings from GBIF citizen-science data. It is the 9th most-seen of the 100 birds we can rate there. Over three days the chance rises to over 90%, if each day is a fresh chance.
February, July and October–November
In those months about 80% of wildlife watchers report a Ridgetop Swiftlet in Davao City on a given day, against about 30% in January, the lowest month.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Ridgetop Swiftlet sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Davao City, in our data
Davao City is the only city on Wallace's Line with enough records to rate Ridgetop Swiftlet sightings: about 70% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Ridgetop Swiftlet is recorded against all the birds logged in Davao City (121 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.
