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Marsh Harrier Circus aeruginosus - with Avocet flock. Wingspan 110-125cm.Graceful wetland raptor. Adult male is mostly reddish brown with blue-grey head and grey tail. In flight, note patches of grey and reddish brown on wings, and black wingtips. Adult female is mainly dark brown with pale leading edge to wings and pale cap and chin. Tail is reddish brown. Juvenile is similar to an adult female but tail is dark brown. Voice – mainly silent. Status and habitat – Commonest in summer months, but some birds are present year-round. Usually seen in flight over marshes and reedbeds. Easiest to see in East Anglia.