Phylloscopus borealoides
Silhouette: Jiekun He · PhyloPic
In 3 days ~20% in a week ~40%
The Sakhalin leaf warbler (Phylloscopus borealoides) is a species of Old World warbler in the family Phylloscopidae. It is found in Sakhalin, the Kuril Islands and Japan; it winters to the Amami and Okinawa islands and Indochina.
Its natural habitat is temperate forests. It has a long white supercilium and broad, dark brown eye-stripes. Its crown, upper parts, and bill are also dark brown. It has greenish-brown cheeks and its ear-coverts are mottled. Its bill has a pink base that extends to the lower mandible. Its legs are pale pinkish-brown.
It is easily confused with the pale-legged leaf warbler. One possible distinguishing feature is that its upperparts are slightly more greenish. It is more easily distinguished by its lower-pitched vocalizations, but some overlap does exist in the species' pitch ranges.
It nests in shrubs. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan | |
| 2 | Khao Luang National Park | 🇹🇭 Thailand | |
| 3 | Khao Sok National Park | 🇹🇭 Thailand | |
| 4 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 5 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 6 | Khao Yai National Park | 🇹🇭 Thailand |
With luck
About 10% of wildlife watchers report a Sakhalin Leaf-Warbler sighting in Nikko National Park on a given day, based on 33 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 65th most-seen of the 102 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
May and June
In those months about 20% of wildlife watchers report a Sakhalin Leaf-Warbler in Nikko National Park on a given day, against under 5% in July to April, the lowest months.
Yes
Of the 6 parks where we can rate Sakhalin Leaf-Warbler sightings, Nikko National Park has the highest daily chance: about 10%. Next come Khao Luang National Park (Thailand, about 10%) and Khao Sok National Park (Thailand, under 5%).
Same genus: Phylloscopus
The closest relatives of the Sakhalin Leaf-Warbler that you can see in Nikko National Park (genus Phylloscopus, Leaf Warblers) are Eastern Crowned-Warbler (about 20%) and Japanese Leaf Warbler (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sakhalin Leaf-Warbler is recorded against all the birds logged in Nikko National Park (33 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.
