Phylloscopus kansuensis
Silhouette: Jiekun He · PhyloPic
In 3 days ~20% in a week ~40%
The Gansu leaf warbler (Phylloscopus kansuensis) is a small passerine bird known only from China. It belongs to the leaf warbler genus Phylloscopus within the family Phylloscopidae. It was formerly treated as a subspecies of Pallas's warbler (P. proregulus) but is now regarded as a separate species based on differences in voice and cytochrome-b gene sequences.
It is 10 cm long, slightly larger than Pallas's warbler. It has greenish upperparts, pale underparts and a pale rump. The head has a long white supercilium and a pale stripe along the centre of the crown. The wings have one conspicuous wingbar, a slight second bar and whitish edges to the tertials.
The song is very different from Pallas's warbler and consists of a thin, high-pitched note followed by a series of accelerating notes and finally a trill. It is known to breed only in Gansu and Qinghai provinces in northern China. Its wintering grounds are uncertain but probably lie in Yunnan province in southern China. It is found up to 3,200 metres above sea-level in deciduous forest with some spruce and juniper. It is not currently known to be threatened with extinction and so is classed as a species of Least Concern by BirdLife International. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Jiuzhaigou National Park | 🇨🇳 China |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Gansu Leaf-Warbler sighting in Jiuzhaigou National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 98th most-seen of the 131 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
In that month about 20% of wildlife watchers report a Gansu Leaf-Warbler in Jiuzhaigou National Park on a given day, against under 5% in April and June–December, the lowest months. That is one of Jiuzhaigou National Park's wettest months, with about 150 mm of rain against 15 mm in December. January to March have too few records to rate.
Only Jiuzhaigou National Park, in our data
Jiuzhaigou National Park is the only park on Wallace's Line with enough records to rate Gansu Leaf-Warbler sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Phylloscopus
The closest relatives of the Gansu Leaf-Warbler that you can see in Jiuzhaigou National Park (genus Phylloscopus, Leaf Warblers) are Buff-barred Warbler (about 50%), Hume's Warbler (about 50%) and Sichuan Leaf-Warbler (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Gansu Leaf-Warbler is recorded against all the birds logged in Jiuzhaigou National Park (8 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.
