Bornean Orangutan, IndonesiaA quick interruption from all the recent Costa Rica posts. I’ve been working on a project featuring critically endangered species that I’ve photographed over the years. The Bornean orangutan is chief among them. This is an alpha male, distinguished by the dish-shaped face. The large, flat cheek pads are called flanges and are a sign of sexual maturity and dominance. Thay not only make the orangutan more attractive to females but also amplify his long calls, which can carry through the forest to assert territory and deter rival males. Photographed back in September of 2009 in Tanjung Puting National Park in Indonesian Borneo. Nikon D700 with Nikkor 70-200mm lens (at 200mm) ISO 800, f/5.6 at 1/125th of a second.