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One interesting note about the Cooper's Hawk is that there is a small knob under the third digit which is unique to this bird. This stubby knob is a giveaway that the accipiter is definitely a Cooper's Hawk.
Reference: http://www.themodernapprentice.com/coope...
Allan I have seen a brown bird with white rump briefly twice now in the park and couldn't identify it. This is it! Thank you!
Thanks for posting this Allan! I have only heard them passing overhead once, never got a good look for myself.