Circus spilonotus
Silhouette: Shyamal · PhyloPic
In 3 days ~10% in a week ~20%
The eastern marsh harrier (Circus spilonotus) is a bird of prey belonging to the marsh harrier group of harriers. It was previously considered to be conspecific with the western marsh harrier (Circus aeruginosus) but is now usually classified as a separate species.
It is 48 to 58 cm long with a wingspan of 113 to 137 cm; like most birds of prey, the female is usually larger than the male. The male's plumage is variable; typically the head, breast, back and wing-coverts are blackish with pale streaks. The rest of the wing is grey with black wingtips and a white front edge. The tail is grey, the rump is white and the underparts are mostly white. The female is dark brown with buff streaking on the head and underparts. The rump is often whitish and the tail has dark bars. Young birds are dark brown with buff on the head and a pale patch on the underwing.
It is usually silent but has a mewing call which is most often uttered at roost sites. Eastern marsh harriers are generally migratory apart from the Papuan... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manas National Park | 🇮🇳 India | |
| 2 | Way Kambas National Park | 🇮🇩 Indonesia | |
| 3 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 4 | Kaziranga National Park | 🇮🇳 India | |
| 5 | Cat Tien National Park | 🇻🇳 Vietnam |
Rare
Under 5% of wildlife watchers report an Eastern Marsh-Harrier sighting in Beijing on a given day, based on 258 verified sightings from GBIF citizen-science data. It is the 124th 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.
April and September–October
In those months about 10% of wildlife watchers report an Eastern Marsh-Harrier in Beijing on a given day, against under 5% in May–August and November–March, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Eastern Marsh-Harrier sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 14 cities where we can rate Eastern Marsh-Harrier sightings, Beijing ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Kunming (China, under 5%).
GBIF citizen-science records
It is estimated from how often the Eastern Marsh-Harrier is recorded against all the birds logged in Beijing (258 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.
