Likely a sharp shinned or blue darter hawk.
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I agree with you on the Sharp-shinned hawk.Maybe a Sharp Shinned or Merlin - hard to tell.
Let's avoid using "blue darter" as we used to use it for both Coopers hawk and sharp-shunned.
X 2 most likely a Sharp Shinned or possibly an immature Cooper's male. Way too small and wrong conformation for a redtail.Bars on the tail visible in the second picture, along with the size say that's a sharp-shinned hawk. Could be a small cooper's also, but I can't see the legs and end of tail shape.