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#0584 · 🐦 birds

Western Marsh Harrier

🇳🇱 Bruine Kiekendief ·Circus aeruginosus

LCleast concern 🐦 Birds 📍 in the Netherlands
Western Marsh Harrier, photo 1 of 9
1/9 © Radovan Václav · CC BY-NC 4.0

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

  • NL sightings 1,206iNaturalist, research grade
  • worldwide 67,397iNaturalist observations
  • weight 40 gadult, up to
  • threat LCleast concern

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

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.

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