I was at a zoo in the Midlands, England. This gorilla was sat away from the others, against the glass. He had his back to the visitors and ignored them when they banged to get his attention. I waited until it was quiet and he turned around, interested by my camera lens. I (dis)like the sad yet strong expression on his face - he's a captive, but also wild and powerful. (I assume it was male, but could be mistaken).