Zosterops erythropleurus
Silhouette: Ferran Sayol · PhyloPic
In 3 days ~20% in a week ~40%
The chestnut-flanked white-eye (Zosterops erythropleurus) is a bird in the family Zosteropidae. The species was first described by Robert Swinhoe in 1863. It is found in forests, and prefers rather deep mixed and coniferous forests.
It is 10.5 cm in length and has a distinct chestnut patch on its flanks. The bill base and lower mandible may be pinkish. Its underparts are whiter. The similar Japanese white-eye is pale brown on its flanks. It is migratory, breeding in Manchuria and migrating to central China, the province of Yunnan and northern Southeast Asia in the winter. It is the most migratory species of white-eye. It breeds in poplar, alder and willow forests, thickets and groves, and winters in deciduous and evergreen forests, usually above 1000 m. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 2 | Khao Yai National Park | 🇹🇭 Thailand | |
| 3 | Jiuzhaigou National Park | 🇨🇳 China | |
| 4 | Kaeng Krachan National Park | 🇹🇭 Thailand |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Schönbrunn Zoo | 🇦🇹 Austria |
With luck
About 10% of wildlife watchers report a Chestnut-flanked White-eye sighting in Jiuzhaigou National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 87th 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.
April and June–August
In those months about 10% of wildlife watchers report a Chestnut-flanked White-eye in Jiuzhaigou National Park on a given day, against under 5% in May and September–December, the lowest months. Those are among Jiuzhaigou National Park's wettest months, with about 150 mm of rain a month against 15 mm in December. January to March have too few records to rate.
Between 2 and 5 am
Across all the parks we cover, that three-hour window holds the most Chestnut-flanked White-eye sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
3rd of 4
Of the 4 parks where we can rate Chestnut-flanked White-eye sightings, Jiuzhaigou National Park ranks 3rd at about 10%. The best odds are in Doi Inthanon National Park (Thailand, about 20%) and Khao Yai National Park (Thailand, about 20%).
GBIF citizen-science records
It is estimated from how often the Chestnut-flanked White-eye is recorded against all the birds logged in Jiuzhaigou National Park (10 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.
