The winter of 1978/79 was an exciting time for the field ornithologist; not only did the cold weather force unusual movements and large concentrations of the regular wintering species, particularly waterbirds, but there were influxes into Britain and Ireland of species that are normally uncommon. Among the latter were Bitterns Botaurus stellaris, Hen Harriers Circus cyaneus, Long-eared Owls Asio&nb

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