Rare this time of year. Starting with basics, the bird can be judged to be an accipiter because of comparatively long tail and short, somewhat rounded wings; next, the accipiter can be judged to be an adult Cooper's or Sharp-shinned Hawk because of underpart coloration and barring. At this point things become more complicated. Cooper's is by far the more obvious option based solely on distribution: Cooper's has recently become a fairly common summer bird in Harris Co., while Sharp-shinned remains virtually absent between spring and fall migration, which is when this bird was seen. However, Sharp-shinned is the more obvious call based solely on the actual characters displayed. The most obvious point is the tip of the tail: clearly square-tipped, or even notched, rather than rounded, with only a very thin light terminal band. (Sometimes molt can call the shape of the tail into question as a key mark, but June seems too early for fall molt.) There are some supporting characters as well. The head is relatively small, not projecting far forward. The wings are pushed forward rather than having a leading edge virtually straight and perpendicular to the axis of the body. (To be sure, this character pertains to soaring birds, and one can't always tell from a single photo whether a raptor is soaring or not.) The trailing edge of the wings are in a clear "S" shape. The tail is relatively thin. Finally, the legs seem thin. This is hard to determine definitively in the present photo, but the suggestion is there, and I have other photos that show this feature more clearly.
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