Grey-rumped swiftlet

The grey-rumped swiftlet is {{cvt|9|-|10|cm}} in length with a square tail.{{cite web |last1=Chantler |first1=P. |last2=Boesman |first2=P. |year=2017 |editor1-last=del Hoyo |editor1-first=J. |editor2-last=Elliott |editor2-first=A. |editor3-last=Sargatal |editor3-first=J. |editor4-last=Christie |editor4-first=D.A. |editor5-last=de Juana |editor5-first=E. |title=Glossy Swiftlet (Collocalia esculenta) |url=http://www.hbw.com/node/55264 |url-access=subscription |accessdate=23 August 2017 |work=Handbook of the Birds of the World Alive |publisher=Lynx Edicions}} The back and upper surface of the wings are dull dark blue with a moderate green gloss. The {{birdgloss|rump}} is paler due to the white margins of feathers forming the {{birdgloss|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 {{birdgloss|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.{{cite journal |last1=Rheindt |first1=Frank E. |last2=Christidis |first2=Les |last3=Norman |first3=Janette A. |last4=Eaton |first4=James A. |last5=Sadanandan |first5=Keren R. |last6=Schodde |first6=Richard |year=2017 |title=Speciation in Indo-Pacific swiftlets (Aves: Apodidae): integrating molecular and phenotypic data for a new provisional taxonomy of the Collocalia esculenta complex |journal=Zootaxa |volume=4250 |issue=5 |pages=401–433 |doi=10.11646/zootaxa.4250.5.1}}

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.{{cite journal |last=Salvadori |first=Tommaso |author-link=Tommaso Salvadori |year=1882 |title=Descrizione di una nuova specie del genere Collocalia ed osservazioni intorno alla C. Infuscata, Salvad. |url=https://www.biodiversitylibrary.org/page/28709695 |journal=Atti della Reale Accademia delle Scienze di Torino |language=Italian |volume=17 |issue=4 |pages=304–306}}{{cite book |url=https://www.biodiversitylibrary.org/page/14476700 |title=Check-list of Birds of the World |publisher=Harvard University Press |year=1940 |editor-last=Peters |editor-first=James Lee |editor-link=James L. Peters |volume=4 |place=Cambridge, Massachusetts |page=229}} Note that the page number given for Salvadori's article is incorrect. The specific epithet maginata is Latin for "bordered" or "edged".{{cite book |last=Jobling |first=James A. |url=https://archive.org/stream/Helm_Dictionary_of_Scientific_Bird_Names_by_James_A._Jobling#page/n241/mode/1up |title=The Helm Dictionary of Scientific Bird Names |publisher=Christopher Helm |year=2010 |isbn=978-1-4081-2501-4 |location=London |page=241}} The grey-rumped swiftlet was previously treated as a subspecies of the glossy swiftlet but was promoted to species status based on the results of a detailed analysis of the swiftlets in the genus Collocalia published in 2017.{{cite web |year=2017 |editor1-last=Gill |editor1-first=Frank |editor1-link=Frank Gill (ornithologist) |editor2-last=Donsker |editor2-first=David |title=Owlet-nightjars, treeswifts & swifts |url=http://www.worldbirdnames.org/bow/swifts/ |accessdate=2 August 2017 |work=World Bird List Version 7.3 |publisher=International Ornithologists' Union}}

There are two subspecies:

• C. m. septentrionalis Mayr, 1945 – Babuyan Island, Cagayan Island, Camiguin Island
• C. m. marginata Salvadori, 1882 – eastern and western Visayan Islands, possibly Palawan

It feeds small insects in flight. Forms groups of up to 40 individuals associating with other swiftlets.

Average clutch is just 1 single egg. Not much else is known about its breeding.

Seen in almost any habitat including coastal areas, montane forest , agricultural lands and even roads. It is still most frequently seen in forests and clearings.

International Union for Conservation of Nature does not yet recognize this as its own species. It has assessed its parent species, the glossy swiftlet as least-concern species.{{Cite journal |last=Kirwan |first=Guy M. |date=2022 |title=Gray-rumped Swiftlet (Collocalia marginata), version 2.0 |url=https://birdsoftheworld.org/bow/species/gyrswi5/2.0/introduction |journal=Birds of the World |language=en |doi=10.2173/bow.gyrswi5.02 |issn=2771-3105}}

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grey-rumped swiftlet

Category:Endemic birds of the Philippines

grey-rumped swiftlet

grey-rumped swiftlet

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