The Hen Harrier is a bird of prey. It breeds throughout the northern parts of the northern hemisphere in Canada and the northernmost USA, and in northern Eurasia. Marsh Hawk is a historical name for the American form.
See, now this is great work. Love the way you’ve handled the b/g, but even more impressive, you've seen what the flight feathers are doing and taken the time to work out WHY theyre doing it. Lovely, lovely piece!