Acrocephalus bistrigiceps
Silhouette: Yves Hoebeke · PhyloPic
In 3 days ~10% in a week ~30%
The black-browed reed warbler (Acrocephalus bistrigiceps) is a marsh-warbler in the family Acrocephalidae. It was formerly included in the "Old World warbler" assemblage. The species was first described by Robert Swinhoe in 1860.
It breeds from eastern Mongolia and south-eastern Russia to eastern China and Japan, and winters in Southeast Asia. The black-browed reed warbler is similar and closely related to the more common and widespread Eurasian reed warbler. The bird spends its time foraging close to the ground inside undisturbed reed beds. Like many other wetland birds, it is of conservation concern owing to habitat loss due to the destruction of native marsh vegetation and its replacement by rice paddies and fishponds. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 2 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 3 | Khao Yai National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Jinan | 🇨🇳 China | |
| 2 | Ho Chi Minh City | 🇻🇳 Vietnam | |
| 3 | Đà Nẵng | 🇻🇳 Vietnam | |
| 4 | Phnom Penh | 🇰🇭 Cambodia | |
| 5 | Beijing | 🇨🇳 China | |
| 6 | Qingdao | 🇨🇳 China | |
| 7 | Bangkok | 🇹🇭 Thailand | |
| 8 | Hangzhou | 🇨🇳 China | |
| 9 | Tuen Mun | 🇨🇳 China | |
| 10 | Singapore | 🇸🇬 Singapore |
Rare
Under 5% of wildlife watchers report a Black-browed Reed Warbler sighting in Kaeng Krachan National Park on a given day, based on 158 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 194th most-seen of the 360 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
January–February and April
In those months about 10% of wildlife watchers report a Black-browed Reed Warbler in Kaeng Krachan National Park on a given day, against under 5% in March and May–December, the lowest months. Those are among Kaeng Krachan National Park's driest months, with about 65 mm of rain a month against 260 mm in September.
Yes
Of the 3 parks where we can rate Black-browed Reed Warbler sightings, Kaeng Krachan National Park has the highest daily chance: under 5%. Next come Cat Tien National Park (Vietnam, under 5%) and Khao Yai National Park (Thailand, under 5%).
GBIF citizen-science records
It is estimated from how often the Black-browed Reed Warbler is recorded against all the birds logged in Kaeng Krachan National Park (158 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.
