April 23, 2012
In this Thursday, Feb. 23, 2012 photo, an orangutan eats at Zoo Atlanta, in Atlanta. A groundbreaking national project housed at Zoo Atlanta is researching heart disease in orangutans through the world’s first awake ultrasounds on the rust-colored apes. (AP Photo/Dorie Turner)
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Orangutans aren't known for their patience, but this one, named Satu, has been trained to let researchers at Zoo Atlanta perform echocardiograms on him while he's awake.