Western Marsh Harrier vs Hen Harrier

In short

The Western Marsh Harrier and Hen Harrier are similar raptors but can be distinguished by their structure and plumage. The Western Marsh Harrier is generally bulkier with broader wings and a longer tail, while the Hen Harrier is more slender with narrower wings. Plumage differences are most notable in males, with the Western Marsh Harrier showing more contrast in its coloration.

Identification tips

1. Structure: Look for the bulkier build and broader wings of the Western Marsh Harrier. 2. Plumage: In males, note the contrasting pale head and shoulders of the Western Marsh Harrier. 3. Habitat: Consider the habitat; Western Marsh Harriers are more likely in wetlands, while Hen Harriers prefer open moorlands. 4. Flight Style: Observe the flight; Western Marsh Harriers may appear more buoyant.

Size

Western Marsh Harrier is bulkier and larger overall compared to the more slender Hen Harrier.

Plumage

Male Western Marsh Harriers have a more contrasting plumage with a distinct pale head and shoulders, whereas male Hen Harriers are more uniformly grey. Female and juvenile plumages are more similar, but Western Marsh Harriers often show a more pronounced pale crown and throat.

Behaviour

Both species exhibit similar hunting behaviors, often seen gliding low over fields and marshes, but Western Marsh Harriers may appear more buoyant in flight.

Habitat

Western Marsh Harriers are often found in wetland habitats, whereas Hen Harriers prefer open moorlands and grasslands. However, there is some overlap in their range.

Voice

Vocalizations are not typically a reliable field mark as both species are generally silent outside of the breeding season.