#0584 · 🐦 birds
Western Marsh Harrier
🇳🇱 Bruine Kiekendief ·Circus aeruginosus
9 photos from iNaturalist (Creative Commons) · credits & licences
what is it?
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 . The genus name Circus is derived from the Ancient Greek kirkos , referring to a bird of prey named for its circling flight ( kirkos , "circle"), probably the hen harrier. The specific aeruginosus is Latin for "rusty".
base stats
Bars compare against all animals on log scales: up to 300,000 Dutch and 600,000 worldwide sightings (the most-seen species), 150 t (blue whale), 30 m and 400 years (Greenland shark).
fun facts
- Spotted 1,206 times in the Netherlands on iNaturalist.
- 67,397 observations worldwide on iNaturalist.
- Weighs only about 40 g.
- Scientifically named in 1758 (268 years ago).
fact sheet
- English
- Western Marsh Harrier
- Nederlands
- Bruine Kiekendief
- scientific name
- Circus aeruginosus
- class
- Aves
- order
- Accipitriformes
- family
- Accipitridae
- IUCN Red List
- LC · least concern
- sightings in NL
- 1,206
- sightings in Europe
- 51,364
- sightings worldwide
- 67,397
- GBIF records in NL
- 437,404
- weight
- 40 g
- length
- —
- lifespan
- —
- named
- 1758
IUCN in Dutch: niet bedreigd. Blank means the sources don't say.
relatives· Accipitridae
#0542 📷 8Common Buzzard
🇳🇱 Buizerd
Buteo buteo
LC 👀 4.1k in NL
#0609 📷 10Eurasian Sparrowhawk
🇳🇱 Sperwer
Accipiter nisus
LC 👀 694 in NL
#0622 📷 8White-tailed Eagle
🇳🇱 Zeearend
Haliaeetus albicilla
LC 👀 494 in NL
#0654 📷 10Hen Harrier
🇳🇱 Blauwe Kiekendief
Circus cyaneus
LC 👀 271 in NL
#0655 📷 9European Honey-buzzard
🇳🇱 Wespendief
Pernis apivorus
LC 👀 268 in NL
#0656 📷 10Eurasian Goshawk
🇳🇱 Havik
Astur gentilis
LC 👀 261 in NL
#0713 📷 10Red Kite
🇳🇱 Rode wouw
Milvus milvus
LC 👀 135 in NL
#0765 📷 9Black Kite
🇳🇱 Zwarte wouw
Milvus migrans
LC 👀 40 in NL
Sources: iNaturalist taxon 5173, Wikidata Q26431, GBIF 2480482, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.
