I would call it a cooper's hawk primarily for the same feature that David Allinson noted, the thickness of the legs; sharpies have legs that are conspicuously thin, pencil thin, and these look pretty sturdy. His mention of the size relative to the prey is another good point.

Kris Baker had the same ID, with no prompting from me.
It's a nice photo, thanks for sharing!

Kevin Li
Ballard, USA
kdli at msn.com
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