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The Western Marsh Harrier (Circus aeruginosus), a bird of prey from temperate and subtropical western Eurasia and adjacent Africa, is a large harrier known for its impressive size and sexual dimorphism. Males typically exhibit a cryptic reddish-brown plumage with lighter streaks and a pale greyish-yellowish head and shoulders, while females are predominantly chocolate-brown with a lighter yellowish crown, nape, and throat.
Males can be identified by their three-colored brown-grey-black appearance in flight, with grey rectrices and secondary and tertiary remiges contrasting with brown forewings and black primary remiges. Females have a darker eye area, making their light eyes stand out, and lack the grey wing-patch and tail seen in males. Juveniles resemble females but with less yellow, particularly on the shoulders.
The Western Marsh Harrier is strongly associated with wetland areas, especially those rich in common reed (Phragmites australis). It can also be found in open habitats such as farmland and grassland, particularly where these border marshland.
