Locustella certhiola
Silhouette: Afsarnayakkan · PhyloPic
In 3 days <5% in a week ~10%
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 migratory, wintering from India eastward to Indonesia. It is a rare migrant in Sri Lanka.
This bird was named after the German zoologist Peter Simon Pallas. The specific certhiola is a diminutive from the genus Certhia, the treecreepers. The sixth edition of Clements Checklist refers to this species as "Pallas's warbler", a name more commonly used for Phylloscopus proregulus.
This small passerine bird is found in tall grass with some thicker vegetation, usually close to water in bogs or wet meadows. From 4 to 7 eggs are laid in a nest on the ground in grass. This species is a very rare vagrant to western Europe. One of the best places to see this skulking species as a vagrant is Fair Isle, Shetland; for a species that only rarely appears in western Europe, it can be found there with some regularity. Wikipedia →
Recording0:34
Russia · 2012
© Natalya Andreyenkova · iNaturalist · CC BY-NC 4.0
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Thailand · 2025
© smathichong · iNaturalist · CC BY-NC 4.0
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Russia · 2025
© Татьяна · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gobi Gurvansaikhan National Park | 🇲🇳 Mongolia | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 3 | Cat Tien National Park | 🇻🇳 Vietnam |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Phnom Penh | 🇰🇭 Cambodia | |
| 2 | Đà Nẵng | 🇻🇳 Vietnam | |
| 3 | Berhampore | 🇮🇳 India | |
| 4 | Kolkata | 🇮🇳 India | |
| 5 | Zhuhai [Macau] | 🇨🇳 China | |
| 6 | Bangkok | 🇹🇭 Thailand | |
| 7 | Ho Chi Minh City | 🇻🇳 Vietnam | |
| 8 | Coimbatore | 🇮🇳 India | |
| 9 | Jakarta | 🇮🇩 Indonesia | |
| 10 | Hong Kong | 🇨🇳 China |
Rare
Under 5% of wildlife watchers report a Pallas's Grasshopper Warbler sighting in Hangzhou on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 167th most-seen of the 219 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
September
In that month about 10% of wildlife watchers report a Pallas's Grasshopper Warbler in Hangzhou on a given day, against under 5% in October to August, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Pallas's Grasshopper Warbler sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
15th of 22
Of the 22 cities where we can rate Pallas's Grasshopper Warbler sightings, Hangzhou ranks 15th at under 5%. The best odds are in Phnom Penh (Cambodia, about 10%), Đà Nẵng (Vietnam, about 10%) and Berhampore (India, about 10%).
Same order: Passeriformes
The closest relatives of the Pallas's Grasshopper Warbler that you can see in Hangzhou (order Passeriformes, Perching Birds) are Light-vented Bulbul (about 80%), Chinese Blackbird (about 70%) and Oriental Magpie-Robin (about 60%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Pallas's Grasshopper Warbler is recorded against all the birds logged in Hangzhou (16 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.
