I'm curious about this. I have ducks, geese, and chickens. My ducks are out free range all day. I have to lock my chickens up for a large part of the day (while I'm at work) because of goshawks, and red tails. I have never lost a duck to a hawk. I have lost many chickens to hawks. I've been thinking about it a lot lately, and wondering why.
I simply don't understand why the hawks don't seem interested in the ducks, including calls, but they pick the chickens off one by one if they are out during the day, unsupervised.
Is it because ducks stick in a larger group, and tend not to wander off like chickens do? Do they seem larger from an aerial standpoint?
Is the fluttering of a chicken just irresistible to a hawk?
In all fairness to chickens, a goshawk went for one of my cream Brabanters, twice, and failed. Those things are like velociraptors.