Hen Harrier vs Montagu's Harrier

In short

The Hen Harrier and Montagu's Harrier are both slender, long-winged raptors, but they can be distinguished by their wing structure and plumage details. Hen Harriers have broader wings with a more pronounced 'hand' and a white rump, while Montagu's Harriers have narrower wings and a less conspicuous rump patch.

Identification tips

• Wing shape: Hen Harriers have broader wings with a more pronounced 'hand,' while Montagu's Harriers have narrower wings.
• Rump patch: Hen Harriers have a more conspicuous white rump.
• Flight style: Montagu's Harriers may appear more buoyant due to their narrower wings.
• Habitat preference: Consider the habitat; Hen Harriers are more likely in moorlands, Montagu's in open fields.
• Plumage details: Look for the extent of black on wingtips in males; Hen Harriers have more extensive black.

Size

Both species are similar in size, but Hen Harriers are slightly bulkier with broader wings.

Plumage

Hen Harriers have a more prominent white rump and broader wings with a more rounded 'hand.' Adult males are pale gray with black wingtips. Montagu's Harriers have a less pronounced white rump and narrower wings. Adult males are also gray but with less extensive black on the wingtips and a more uniform appearance.

Behaviour

Both species exhibit similar hunting behaviors, flying low over fields and marshes, but Montagu's Harriers may appear more buoyant in flight due to their narrower wings.

Habitat

Hen Harriers are often found in open moorlands and marshes, while Montagu's Harriers prefer more open, agricultural landscapes and steppe habitats.

Voice

Vocalizations are similar and not a reliable field mark for differentiation.