Circus aeruginosus
Silhouette: Mathieu Pélissié · PhyloPic
In 3 days >90%
The western marsh harrier (Circus aeruginosus) is a large harrier, a bird of prey from temperate and subtropical western Eurasia and adjacent Africa. It is also known as the Eurasian marsh harrier. Formerly, a number of relatives were included in C. aeruginosus, which was then known as "marsh harrier". The related taxa are now generally considered to be separate species: the eastern marsh harrier (C. spilonotus), the Papuan harrier (C. spilothorax) of eastern Asia and the Wallacea, the swamp harrier (C. approximans) of Australasia and the Madagascar marsh harrier (C. maillardi) of the western Indian Ocean islands.
The western marsh harrier was scientifically described by Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Falco aeruginosus. Linnaeus specified the locality as Europe but restricted this to Sweden in 1761. The western marsh harrier is now placed in the genus Circus that was introduced by Bernard Germain de Lacépède...
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Vasai-Virar | 🇮🇳 India | |
| 2 | Rabat | 🇲🇦 Morocco | |
| 3 | Luxor | 🇪🇬 Egypt | |
| 4 | Cairo | 🇪🇬 Egypt | |
| 5 | Kalyan-Dombivli | 🇮🇳 India | |
| 6 | Tunis | 🇹🇳 Tunisia | |
| 7 | Indore | 🇮🇳 India | |
| 8 | Abu Dhabi | 🇦🇪 United Arab Emirates | |
| 9 | Surat | 🇮🇳 India | |
| 10 | Helsinki | 🇫🇮 Finland |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | ZooParc de Beauval | 🇫🇷 France | |
| 2 | Parc du Belvédère | 🇹🇳 Tunisia | |
| 3 | Tiergarten Halberstadt | 🇩🇪 Germany | |
| 4 | Hortobágyi Madárpark | 🇭🇺 Hungary | |
| 5 | Дендропарк ім. Бенедикта Дибовського | 🇺🇦 Ukraine | |
| 6 | akwarium warszawskiego ZOO | 🇵🇱 Poland | |
| 7 | hipopotamiarnia i akwarium morskie warszawskiego ZOO | 🇵🇱 Poland |
Very likely
About 70% of wildlife watchers report a Western Marsh-Harrier sighting in Djoudj National Bird Sanctuary on a given day, based on 168 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 12th most-seen of the 173 birds we can rate there. Over three days the chance rises to over 90%, if each day is a fresh chance.
February and December
In those months about 80% of wildlife watchers report a Western Marsh-Harrier in Djoudj National Bird Sanctuary on a given day, against about 60% in April, the lowest month. Those are among Djoudj National Bird Sanctuary's driest months, with almost no rain against 55 mm in August. May to October have too few records to rate.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Western Marsh-Harrier sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
4th of 45
Of the 45 parks where we can rate Western Marsh-Harrier sightings, Djoudj National Bird Sanctuary ranks 4th at about 70%. The best odds are in Hortobágy National Park (Hungary, about 80%), Kiskunság National Park (Hungary, about 70%) and Fertő-Hanság National Park (Hungary, about 70%). All parks ranked.
Same genus: Circus
The closest relatives of the Western Marsh-Harrier that you can see in Djoudj National Bird Sanctuary (genus Circus, Harriers) are Montagu's Harrier (about 20%) and Pale Harrier (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Western Marsh-Harrier is recorded against all the birds logged in Djoudj National Bird Sanctuary (168 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.
