Zosterops erythropleurus
Silhouette: Ferran Sayol · PhyloPic
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Chestnut-flanked White-eye sighting in Beijing on a given day, based on 181 verified sightings from GBIF citizen-science data. It is the 150th most-seen of the 324 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Chestnut-flanked White-eye in Beijing on a given day, against under 5% in October to August, the lowest months. That is one of Beijing's wettest months, with about 65 mm of rain against almost none in January.
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.
Among the best
Of the 6 cities where we can rate Chestnut-flanked White-eye sightings, Beijing ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Tianjin (China, under 5%).
GBIF citizen-science records
It is estimated from how often the Chestnut-flanked White-eye is recorded against all the birds logged in Beijing (181 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.
