Phylloscopus ricketti
Silhouette: Jiekun He · PhyloPic
In 3 days ~10% in a week ~20%
The sulphur-breasted warbler (Phylloscopus ricketti) is a species of Old World warbler in the family Phylloscopidae. It breeds in China; it winters to Laos, Thailand and Cambodia. Its natural habitats are temperate forests and subtropical or tropical moist lowland forests. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Yai National Park | 🇹🇭 Thailand | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 3 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 4 | Cuc Phuong National Park | 🇻🇳 Vietnam |
Rare
Under 5% of wildlife watchers report a Sulphur-breasted Warbler sighting in Cuc Phuong National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 121st most-seen of the 159 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.
November
In that month about 10% of wildlife watchers report a Sulphur-breasted Warbler in Cuc Phuong National Park on a given day, against under 5% in August–October and December–June, the lowest months. That is one of Cuc Phuong National Park's driest months, with about 70 mm of rain against 390 mm in August. July has too few records to rate.
Between 4 and 7 am
Across all the parks we cover, that three-hour window holds the most Sulphur-breasted Warbler 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.
4th of 4
Of the 4 parks where we can rate Sulphur-breasted Warbler sightings, Cuc Phuong National Park ranks 4th at under 5%. The best odds are in Khao Yai National Park (Thailand, about 20%), Kaeng Krachan National Park (Thailand, about 10%) and Doi Inthanon National Park (Thailand, under 5%).
Same genus: Phylloscopus
The closest relatives of the Sulphur-breasted Warbler that you can see in Cuc Phuong National Park (genus Phylloscopus, Leaf Warblers) are Yellow-browed Warbler (about 50%) and Limestone Leaf-Warbler (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sulphur-breasted Warbler is recorded against all the birds logged in Cuc Phuong 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.
