西方澤鵟 Circus aeruginosus

Gangly raptor with long wings and tail; local in marshes and wetlands with extensive reed beds. Mainly seen in flight, quartering fairly low over marshes, with wings raised in shallow V. Commonest plumage dark brown overall with variable creamy cap, throat, and narrow leading edge to wing. Brightest adult males have tricolored upperwings, grayish tail, pale head and breast contrasting with rusty-brown belly. Extremely similar to closely related Eastern Marsh-Harrier; males of that species are darker-headed and browner-chested, and females are warmer brown and streakier on the chest, without Eurasian's discrete white 'cap' and dark line through the eye.