The 'Marsh Hawk' problem
01 September 1983
Main paper
A 'ringtail' harrier at Cley, Norfolk, from October 1957 to April 1958 was identified as a first-year Hen Harrier Circus cyaneus of the Nearctic subspecies hudsonius (previously known as Marsh Hawk in North America, but now called Northern Harrier) bec...
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