Silverback Mountain Gorilla, Mgahinga, UgandaAdult male mountain gorillas are called silverbacks for an obvious reason — all that silver hair growing on their backs. I asked this one if he would be so kind as to turn around so that I could get a picture of that silver hair. He respectfully obliged and allowed me to snap a few shots before turning to face me again. Photographed in the mountains of Mgahinga National Park in Uganda. Nikon D850 with Nikkor 70-200mm lens (at 160mm) ISO 800, f/4 at 1/400th of a second.