Acrocephalus bistrigiceps
Silhouette: Yves Hoebeke · PhyloPic
In 3 days ~20% in a week ~40%
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 |
With luck
About 10% of wildlife watchers report a Black-browed Reed Warbler sighting in Beijing on a given day, based on 562 verified sightings from GBIF citizen-science data. It is the 72nd most-seen of the 324 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.
September
In that month about 30% of wildlife watchers report a Black-browed Reed Warbler in Beijing on a given day, against under 5% in July and November–April, the lowest months. That is one of Beijing's wettest months, with about 65 mm of rain against almost none in January.
Among the best
Of the 18 cities where we can rate Black-browed Reed Warbler sightings, Beijing ranks 5th at about 10%, level with the leaders once rounded. The best odds are in Jinan (China, about 10%), Ho Chi Minh City (Vietnam, about 10%) and Đà Nẵng (Vietnam, about 10%).
GBIF citizen-science records
It is estimated from how often the Black-browed Reed Warbler is recorded against all the birds logged in Beijing (562 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.
