Phylloscopus proregulus
Silhouette: Margot Michaud · PhyloPic
In 3 days ~50% in a week ~80%
Pallas's leaf warbler (Phylloscopus proregulus) or Pallas's warbler is a bird that breeds in mountain forests from southern Siberia east to northern Mongolia and northeast China. It is named after the German zoologist Peter Simon Pallas, who first formally described it. This leaf warbler is strongly migratory, wintering mainly in south China and adjacent areas of southeast Asia, although in recent decades increasing numbers have been found in Europe in autumn.
Pallas's leaf warbler is one of the smallest Palearctic warblers, with a relatively large head and short tail. It has greenish upperparts and white underparts, a lemon-yellow rump, and yellow double wingbars, supercilia and central crown stripe. It is similar in appearance to several other Asian warblers, including some that were formerly considered to be subspecies of it, although its distinctive vocalisations aid identification.
The female builds a cup nest in a tree or bush, and incubates the four to six eggs, which hatch after 12–13 days. The chicks are fed mainly by the female and fledge when they are 12–14 days old; both parents then bring food for about a week. Pallas's leaf warbler is insectivorous, feeding on the adults, larvae and pupae of small insects and spiders. Birds forage in bushes and trees, picking items from leaves or catching prey in short flights or while hovering. The Pallas's leaf warbler has a large range, and its numbers are believed to be stable. It therefore is evaluated as of "least concern" by the International Union for Conservation of Nature (IUCN). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gobi Gurvansaikhan National Park | 🇲🇳 Mongolia | |
| 2 | Doi Inthanon National Park | 🇹🇭 Thailand |
Possible
About 20% of wildlife watchers report a Pallas's Leaf-Warbler sighting in Gobi Gurvansaikhan National Park on a given day, based on 55 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 45th most-seen of the 122 birds we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
May
In that month about 40% of wildlife watchers report a Pallas's Leaf-Warbler in Gobi Gurvansaikhan National Park on a given day, against under 5% in August, the lowest month. January–April and October–November have too few records to rate.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Pallas's Leaf-Warbler sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Pallas's Leaf-Warbler sightings, Gobi Gurvansaikhan National Park has the highest daily chance: about 20%. Next come Doi Inthanon National Park (Thailand, under 5%).
Same genus: Phylloscopus
The closest relatives of the Pallas's Leaf-Warbler that you can see in Gobi Gurvansaikhan National Park (genus Phylloscopus, Leaf Warblers) are Dusky Warbler (about 20%), Sulphur-bellied Warbler (about 10%) and Arctic Warbler (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Pallas's Leaf-Warbler is recorded against all the birds logged in Gobi Gurvansaikhan National Park (55 verified sightings from 2019 to 2026), 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.
