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** FILE ** Rhesus monkeys Canto, 27 (left), which is on a restricted diet, and Owen, 29, which is on an unrestricted diet, are pictured at the Wisconsin National Primate Research Center at the University of Wisconsin in Madison, Wis., in 2009. (AP Photo/University of Wisconsin-Madison, Jeff Miller)
Photo by: Jeff Miller
** FILE ** Rhesus monkeys Canto, 27 (left), which is on a restricted diet, and Owen, 29, which is on an unrestricted diet, are pictured at the Wisconsin National Primate Research Center at the University of Wisconsin in Madison, Wis., in 2009. (AP Photo/University of Wisconsin-Madison, Jeff Miller)

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