I was just getting ready to say juvenile Turkey Vultures have dark heads. 

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Hard to really tell but I assume....hawk or eagle maybe?With many of our crow-friends gone for the winter, my ducks are spotting airborne dangers more frequently now. On Saturday a large bird of prey was circling over us, caught it on video when it came lower and sat up shop in a tree:
Anybody an idea what kind of predator this is? - And is it a particular danger to my ducks?
Thank you very much in advance for your help.