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+฀46฀+ rouGh-leGGed hawk Buteo lagopus This uncommon although regular winter resident arrives in Iowa in late October and leaves by late March. Its nesting range is the Arctic tundra, and its periodic incursions into northern states depend upon the availability of food. A large raptor hovering over an open field in winter is nearly always a roughleg . Two color phases—dark and light—occur in Iowa; light-phase birds seem to be more common. qr +฀47฀+ ...

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