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Nice shot. Only adults have the red tail. They have a belly band which is a dark band of streaks along the lower belly leaving most of the upper belly and chest light. They also have what is called a patagial patch on the wing. It's a dark patch along the edge of the part of the wing which you might call the shoulder. Other hawks have slightly different markings, and red-tails are extremely variable but these are the things I look for to ID them.