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MOVEMENTS & MIGRATIONS: Sedentary in Equatorial forests; migratory in subtropical savannas7,11. Southern most breeders migrate furthest, with H. s. cyanoleuca occurring on passage in Lake Victoria basin and wintering as far north as s Sudan Apr-Sept2,11. Migrates at night7, singly or in small, very loose groups11. Present in s Africa in rainy season1. Present in nw Botswana Nov-Apr, Zimbabwe Oct-Apr (but only a passage migrant on central plateau Nov, Apr), Gauteng Jan-Mar, KwaZulu-Natal Sept-Apr7,8,11. Birds in n Botswana and Namibia may belong to different subpopulation to birds further east. Birds in n Botswana arrive ca 2 wk earlier than birds in se Botswana, latter forming part of ne S African population7,17.
HABITAT: Wooded savannas; strongly associated with fresh water20. Perhaps most common in man-altered habitats12. Inhabits well-developed woodland, particularly tall riverine Acacia stands and Mopane Colophospermum mopane, especially where grass understorey heavily grazed. Usually avoids closed cover. In s Africa, particularly common in swamp-fringing woodlands of Okavango Delta, Botswana; also abundant in Limpopo R basin, S Africa7. Rare to common in miombo (Brachystegia) woodland20. Also farmland, parks and large gardens11. Needs trees with holes for br7; pair often attracted to large, solitary, leafy tree in otherwise open ground11. From sea level to 1 500 m, less often up to 2 000 m11, favouring altitudes < 1 000 m7.
Author:JK Turpie
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