Cooper's Hawk or Sharp-shinned: the field marks that survive contact
Half the identification advice for these two only works on a bird sitting still at forty feet. Here is what still works when it is crossing your yard at speed.
Backyard
Birds you can see without going anywhere, and how to get more of them.
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Start here: your first ten birds
You do not need to learn 900 species. You need to learn ten, properly, and let the other 890 arrive on their own.