Is that a Cooper's Hawk or a Sharp-shinned Hawk? Bird ID Guide by @PortlandBirder : r/whatsthisbird
Broad-winged Hawk Identification, All About Birds, Cornell Lab of Ornithology
File:Coopers Hawk From The Crossley ID Guide Eastern Birds.jpg - Wikipedia
Cooper's Hawk Fact Sheet – HawkWatch International
the Cooper's Hawk - PawsPartners - An Alliance for the Animals
Accipiter Identification
How pro-birders identify hawks from far away
Field Marks - FeederWatch
How to Make Cooper's Hawk Identification
NETN Species Spotlight - Sharp-shinned Hawk (U.S. National Park Service)