Photographic Evidence

Researchers at the Wildlife Conservation Society and Max Planck Institute for Evolutionary Anthropology have released the first ever photos of wild gorillas mating face to face, looking into each other's eyes. “Understanding the behavior of our cousins the great apes sheds light on the evolution of behavioral traits in our own species and our ancestors,” Thomas Breuer, the German conservation biologist who took the pictures in the Republic of Congo, said in a press release. —Heather Wax