Always tough to get a good shot of this beautiful all male Silverback Gorilla. Rarely find him next to the glass, and so close. The challenge is always the very dirty glass in front of him. He was really close, just on the other side of the glass in front of me. Glass was full of smudges and such on both sides plus reflections of onlookers. I waited, and finally alone with him. I found a small gap of clear glass, put the 100-400mm lens right up to the glass, at an angle, and he just looked right at me for only a few seconds. Amen.