Definition of hen harrier
: a slender, long-tailed, Eurasian hawk (Circus cyaneus) inhabiting open and marshy regions that is largely pale gray above and white below in the adult male and brown above and buff with dark streaks below in the female and young male In Britain, the hen harrier, Circus cyaneus, is a beautiful but scarce bird of prey, today found mainly on moorland in Scotland. — Robert M. May, Nature, 25 Sept. 1997 — see northern harrier
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