Hen Harrier

Hen Harrier

The Hen Harrier is a slender, long-winged raptor of moorland, grassland, and farmland across much of Europe and Asia, closely related to and until relatively recently considered the same species as the North American Northern Harrier. Its striking sexual dimorphism, with pale grey males and warm brown females, has earned the male the nickname 'grey ghost.'

Like other harriers, it hunts low over open ground with wings held in a shallow V, relying on a combination of keen eyesight and an owl-like facial disc that helps it detect prey by sound in dense vegetation.

Identifying Hen Harrier Feathers

• Primaries/secondaries: pale grey with black wingtips in males; brown, more heavily barred in females and juveniles.
• Tail feathers: long and narrow, with several evenly spaced dark bands; females and juveniles are often called 'ringtails' for this banded tail pattern.
• Rump feathers: a conspicuous white patch above the tail base in both sexes and juveniles, a key identification feature.
• Facial disc feathers: short, stiff feathers forming an owl-like disc around the face.
• Body feathers: males are pale grey above, white below; females and juveniles are brown above with buffy, streaked underparts.
• The white rump patch combined with a narrow, evenly banded tail helps separate this species from the darker, less strongly tail-banded Western Marsh Harrier.

Plumage

Adult males are pale grey above with black wingtips and white underparts. Females and juveniles are brown above with buffy, streaked underparts and a strongly banded tail, earning them the nickname 'ringtail.' All ages and sexes share a bold white rump patch. Juveniles closely resemble adult females, with males gaining grey plumage over roughly two years.

Habitat & Range

Breeds across open moorland, grassland, and marsh in Europe and Asia, also using agricultural land, especially in winter. Northern and montane populations are migratory, moving to lower elevations or further south for winter, while some populations in milder regions are resident.

Behavior & Field Notes

Hen Harriers hunt low over open ground, using a slow, quartering flight to detect small mammals and birds by sight and sound. They nest on the ground in dense vegetation, often in moorland or marsh. Calls include sharp, repeated notes given near the nest, especially during aerial displays. A pale grey feather with black tips, or a brown feather with strong even tail banding and a white rump patch, found on open moorland or grassland is consistent with this species.