I'm not real familiar with the Red Shouldered Hawk, but I'm pretty familiar with the Redtails. I vote Redtail. They are extremely variable and as mentioned earlier, there are 16 subspecies, including one we get here in the winter with a white tail and chocolate brown chest called the Harlan's Redtail.
Better late than never... I throw in my 2 cents. The tail in flight looks just like the re-tailed... the red-shouldered haveing darker tails with blk/white bands.
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