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Cool spotting! I agree with Ashley on this ID. The shape of the head and body, length of the ears and where the eyes sit all say that this is a Hare species.
Here are a couple of links with images of Desert Cottontail for comparison: http://www.desertusa.com/animals/desert-...
http://www.nhptv.org/natureworks/desertc...
http://en.wikipedia.org/wiki/Desert_cott...