Grouse managers want to maximize the number of birds available for shooting, and see any predation by hen harriers as a threat. (sciencedaily.com)
According to Redpath: «The model suggested that across the grouse moors of England there was room for 70 pairs of hen harriers at relatively low cost for grouse shooting.» (sciencedaily.com)
Deemed as one species spread across different continents, scientists confirm that the Eurasian Hen Harrier and the American Northern Harrier are in fact two distinct species. (sciencedaily.com)