Birds Active during the day

Hen Harrier

Circus cyaneus

iNaturalist eBird Wikipedia

Affectionately known as the 'Grey Ghost' in its male form, the Hen Harrier is a spectral hunter of the open plains. With its owl-like face and buoyant, low-gliding flight, it is one of the most mesmerizing birds of prey to spot on a backyard horizon.

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Quick Identification

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Size

Length 41–52 cm (16–20 in); Wingspan 97–118 cm (38–46 in); Weight 300–700g (10.6–24.7 oz)

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Colors

Males are pale silver-grey above and white below with black wingtips; females and juveniles are brown with barred tails and a white rump.

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Key Features

Low, buoyant gliding flight with wings held in a 'V' shape
Conspicuous white rump patch visible in both sexes
Owlish facial disc for hunting by sound
Males are distinctively silver-grey ('The Grey Ghost')

When You’ll See Them

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Activity pattern Active during the day

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Peak hours Early morning and late afternoon

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Season Year-round in resident areas; October-March for wintering grounds

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Diet Small mammals (especially voles and mice) and small ground-nesting birds; they hunt by flying low and pouncing suddenly.

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Habitat Open landscapes including moorlands, salt marshes, wet grasslands, and occasionally large agricultural fields.

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Where Does the Hen Harrier Live?

Native to the vast expanses of Eurasia, the Hen Harrier occupies a massive range stretching from the British Isles and Western Europe through Russia to the Pacific coast of Asia. In milder regions like the United Kingdom and France, many populations are resident year-round, while those in the northern reaches of Scandinavia and Siberia migrate south to Central Asia and the Mediterranean for the winter. This raptor is a specialist of the open wild, avoiding dense forests in favor of sweeping plains and coastal wetlands.

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8 Countries

50M km² Range

Least Concern Conservation

GB United Kingdom Russia FR France CN China DE Germany ES Spain Kazakhstan JP Japan

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iNaturalist / Verified observation data

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Behavior

The Hen Harrier is a master of low-level surveillance, known for its distinctive hunting style called 'quartering.' It flies just a few meters above the ground, methodically scanning and listening for movement in the vegetation below. Unlike many other hawks that rely solely on sight, the Hen Harrier has a facial ruff similar to an owl, which helps funnel sound into its ears to detect prey hiding in thick grass.

These birds are generally solitary during the breeding season, but they exhibit a fascinating social behavior in the winter: communal roosting. During the colder months, several harriers may gather at dusk to sleep in the same patch of marshland or tall grass. While they are wary of humans and rarely venture into dense urban centers, they are a frequent sight for those living near large, open natural spaces.

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Camera Tips

Capturing a Hen Harrier on a backyard camera is a challenge unless your property borders a large field, moor, or marsh. Because they hunt by 'skimming' the ground, the best camera placement is at the edge of an open area facing toward the center of the field. Set your camera on a fence post or a dedicated stake about 3 to 5 feet off the ground, angled slightly downward to catch them as they bank or pounce on prey.

Since these birds are highly active hunters, fast trigger speeds are essential. If your camera supports it, use 'High' sensitivity settings for the PIR sensor and set the video duration to at least 20 seconds; their low-gliding flight often takes them across the frame quickly, and you’ll want to see the characteristic 'V' shape of their wings. Avoid using artificial baits, as these raptors are strictly visual and auditory hunters that prefer live, moving prey like voles.

Pay close attention to the wind direction; harriers often hunt into the wind to maintain their slow, buoyant flight. Placing your camera on the leeward side of a field where they are likely to hover or stall in the wind will increase your chances of a clear shot. During winter, look for reedbeds or tall grass patches—if you find a communal roost, placing a camera on the perimeter could capture multiple birds arriving at dusk.

Similar Species

Species that look similar or are commonly confused with Hen Harrier.

Montagu's Harrier

Montagu's are slimmer with narrower wings; males have a black bar across the secondaries which Hen Harriers lack.

Pallid Harrier

Males are much paler with smaller, wedge-shaped black wingtips; females are nearly identical but have a more distinct neck collar.

Northern Harrier

The North American counterpart; males are darker grey and females have more rufous tones on their underparts.

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Frequently Asked Questions

Hen Harriers are diurnal and are most active during the daylight hours. Their peak hunting activity usually occurs in the early morning and late afternoon (golden hours) when their prey, such as voles and small birds, are most active.

You cannot easily attract Hen Harriers with birdseed or feeders. However, maintaining high grass or 'wild' patches on larger properties encourages the presence of small mammals, which are the harrier's primary food source. They are most likely to visit if you have wide, unobstructed views of fields or marshes.

Their diet consists primarily of small mammals like voles, mice, and shrews. During the breeding season, they also take a significant number of small ground-nesting birds, such as meadow pipits and skylarks.

No, Hen Harriers are generally shy of human development. They require large, open spaces to hunt. You are more likely to see them in rural areas, coastal regions, or suburban fringes that border significant nature reserves or agricultural land.

A Hen Harrier has much longer, narrower wings and a longer tail than a Sparrowhawk. Look for the harrier's habit of gliding with its wings in a 'V' shape (dihedral), whereas Sparrowhawks typically use a 'flap-flap-glide' pattern and have rounded wings.

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