George, a white-handed gibbon, looks off in the distance while in his enclosure at The Knoxville Zoo March 6, 2012. The photo was shot with an iPhone 4 hidden behind a mirror that was placed on the animal's enclosure. The mirror was placed on the enclosure to test the animal's responsiveness to seeing its reflection. (ADAM BRIMER/NEWS SENTINEL)
Knoxville Zoo animals react to seeing their reflection in mirrors. The mirrors had an iPhone 4 and a GoPro Hero 2 camera mounted to the back of them to capture the reactions. Photos in this gallery were made with the iPhone 4, iPhone 3Gs, GoPro Hero 2 and Nikon D3s.