Abstract The Hen Harrier Circus cyaneus recolonised North-east Scotland in the 1940s and expanded its population and range into the 1990s. Coordinated survey and monitoring during 1980–2014, together with supplementary records, identified 118 discrete breeding areas. The vast majority were on moorland managed for Red Grouse Lagopus lagopus sport shooting. Peak numbers of at least 28 breedi


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