That just doesn't make sense to me. We have only ever had 2 ducks at a time. We don't have lots of wildlife in our development. Lots of squirrels, but I've never even seen a raccoon! I know they are out there, but I've never seen them. Yet here we are, hawks aplenty.
Red tailed hawks do eat squirrels -that might be why the hawks are there. They hunt by sitting still on a fence or in a tree and waiting for something to move. The big tree you said is in your yard might be just right for them. So sorry!