At dusk, in Kenya’s Maasai Mara National Reserve, David waited for the herd of elephants on their evening trek to a waterhole. As they got closer to his vehicle, he could see that the mellow light from the fast-setting sun was emphasizing every wrinkle and hair. For a photographer who enjoys working with texture, this was a gift. When they were just a few meters away, he could see the different qualities of different parts of their bodies – the deep ridges of their trunks, the mud-caked ears and the patina of dried dirt on their tusks.