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Accipitridae adult Africa areas autumn barred behaviour Bijleveld 1974 bill birds birds ringed black-brown breast breeding season brood Brown and Amadon buteo cere chicks chukar claws clutches common vole copulation coverts crown dark brown darker Dementiev and Gladkov display Eagle eggs eyrie Falco feathers feeding Finland flanks fledging flight flight-feathers flocks Food-call Glutz grey-brown ground habitat hatching head High-circling hunting immature incubation inner webs Juvenile lagopus less mainly mantle Meyburg migration morph mottled moult nape neck nest-site nesting territory Nestling nominate numbers occasionally off-white outer pairs pale buff paler perch peregrinus plumage population prey primaries range Red Grouse rodents roost rufous scapulars sexes shaft-streaks Sky-dance slightly sometimes species spots Steppe Eagle streaked tail tail-feathers tarsus Tawny Eagle Thiollay tips trees underparts upper tail-coverts upper wing-coverts upperparts USSR usually voles West Germany west Palearctic Willow Grouse wing-coverts wings winter young