Editing Pallas's grasshopper warbler

{{Short description|Species of bird}}
{{For|the ''[[Phylloscopus]]'' warbler species|Pallas's warbler}}
{{speciesbox
| name = Pallas's grasshopper warbler
| image = Rusty-rumped Warbler (Locustella certhiola) I IMG 2750.jpg
| image_caption = In  [[Kolkata]], [[West Bengal]], [[India]].
| status = LC
| status_system = IUCN3.1
| status_ref = <ref>{{cite iucn|author=BirdLife International |year=2016|title=''Locustella certhiola''|page=e.T22714664A94423321|doi=10.2305/IUCN.UK.2016-3.RLTS.T22714664A94423321.en|accessdate=20 May 2021}}</ref>
| genus = Helopsaltes
| species = certhiola
| authority = ([[Peter Simon Pallas|Pallas]], 1811)
| synonyms = *''Locustella certhiola'' <small>(Pallas, 1811)</small>
*''Motacilla certhiola'' <small>Pallas, 1811</small>
| synonyms_ref = <ref name = Avibase>{{cite web | url = https://avibase.bsc-eoc.org/species.jsp?avibaseid=4C3CF429E3FEFBA2 | title = Pallas's Grasshopper-Warbler Helopsaltes certhiola (Pallas, 1811) | accessdate = 20 May 2021| author = Denis Lepage | website = Avibase}}</ref>
}}
[[File:Locustella certhiola MHNT.ZOO.2010.11.195.23.jpg|thumb|''Locustella certhiola'' - [[MHNT]]]]

'''Pallas's grasshopper warbler''' ('''''Helopsaltes certhiola'''''), also known as the '''rusty-rumped warbler''', is an [[Old World warbler]] in the genus ''[[Helopsaltes]]''. It breeds in the eastern [[Palearctic]]: from the Altai Mountains, Mongolia and Transbaikalia to northeastern China, the Korean Peninsula, and islands in the Sea of Okhotsk (Sakhalin and Kuril Islands). It is [[bird migration|migratory]], wintering from [[India]] eastward to [[Indonesia]]. It is a rare migrant in [[Sri Lanka]].

==Etymology==
This bird was named after the German zoologist [[Peter Simon Pallas]]. The specific ''certhiola'' is a diminutive from the genus ''Certhia'', the [[treecreeper]]s.<ref name=job>{{cite book | last= Jobling | first= James A | year= 2010| title= The Helm Dictionary of Scientific Bird Names | url= https://archive.org/details/Helm_Dictionary_of_Scientific_Bird_Names_by_James_A._Jobling | publisher= Christopher Helm | location = London | isbn = 978-1-4081-2501-4 | pages = [https://archive.org/details/Helm_Dictionary_of_Scientific_Bird_Names_by_James_A._Jobling/page/n97 97], 229}}</ref>

The sixth edition of ''[[Clements Checklist]]'' <ref>Clements, James F. (2007) ''The Clements Checklist of Birds of the World'' [[Cornell University Press]] {{ISBN|978-0-8014-4501-9}}</ref> refers to this species as "Pallas's warbler", a name more commonly used for ''[[Phylloscopus proregulus]].''

==Habitat==
This small [[passerine]] [[bird]] is found in tall grass with some thicker vegetation, usually close to water in bogs or [[wet meadow]]s. From 4 to 7 eggs are laid in a nest on the ground in grass. This species is a very rare [[Vagrancy (biology)|vagrant]] to western [[Europe]]. One of the best places to see this [[:wikt:skulk|skulking]] species as a vagrant is [[Fair Isle]], [[Shetland Islands|Shetland]]; for a species that only rarely appears in western Europe, it can be found there with some regularity.

==Description==
[[Image:Rusty-rumped Warbler (Locustella certhiola) I IMG 2748.jpg|thumb|right| In [[Kolkata]], [[West Bengal]], [[India]].]]
This is a medium-sized warbler. The adult has a streaked brown back, whitish grey underparts, unstreaked except on the undertail. The sexes are identical, as with most warblers, but young birds are yellower below. Like most warblers, it is insectivorous. It is very similar to the [[common grasshopper warbler]], but is slightly larger, has white tips to the tail and tertial feathers, and a warmer brown rump. The white tips are the reason for its [[colloquial]], [[mnemonic]] name of "[[PG Tips]]".

This is a skulking species which is very difficult to see except sometimes when singing. It creeps through grass and low foliage.

==Voice==
The song is not the mechanical insect-like reeling produced by the common grasshopper warbler and some other ''Locustella'' warblers, but an inventive ''Acrocephalus''-like melody.

==Subspecies==
Five subspecies recognized:
*''H. c. rubescens'' <small>Blyth, 1845</small>
*''H. c. sparsimstriatus'' <small>Meise, 1934</small>
*''H. c. certhiola'' <small>(Pallas, 1811) </small>
*''H. c. centralasiae'' <small>Sushkin, 1925</small>
*''H. c. minor'' <small>David & Oustalet, 1877</small>

==References==
{{Reflist}}
{{Taxonbar|from=Q1345750}}

[[Category:Helopsaltes|Pallas's grasshopper warbler]]
[[Category:Birds of Mongolia]]
[[Category:Birds of Manchuria]]
[[Category:Birds described in 1811|Pallas's grasshopper warbler]]