Collocalia marginata
In 3 days >90%
The grey-rumped swiftlet (Collocalia marginata) or grey-rumped swiftlet, is a small bird in the swift family Apodidae. It is endemic to the Philippines where it is found on most islands except Mindanao. Its natural habitat is tropical moist lowland forests. It was previously considered a subspecies of the glossy swiftlet.
The grey-rumped 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 dull dark blue with a moderate green gloss. The rump is paler due to the white margins of feathers forming the uppertail coverts. The throat and upper breast are 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 grey-rumped swiftlet was described by the Italian ornithologist Tommaso Salvadori in 1882 and given the current binomial name Collocalia marginata. The type locality is the island of Cebu in the Philippines. The specific epithet... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Very likely
About 80% of wildlife watchers report a Gray-rumped Swiftlet sighting in Cebu City on a given day, based on 262 verified sightings from GBIF citizen-science data. It is the 6th most-seen of the 82 birds we can rate there. Over three days the chance rises to over 90%, if each day is a fresh chance.
August–September and November
In those months about 90% of wildlife watchers report a Gray-rumped Swiftlet in Cebu City on a given day, against about 50% in February, the lowest month.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Gray-rumped Swiftlet sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 2 cities where we can rate Gray-rumped Swiftlet sightings, Cebu City has the highest daily chance: about 80%. Next come Manila (Philippines, about 50%).
GBIF citizen-science records
It is estimated from how often the Gray-rumped Swiftlet is recorded against all the birds logged in Cebu City (262 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.
