Bornean White-Bearded Gibbon, Tanjung Puting National Park, IndonesiaThe Bornean white-bearded gibbon is a different species from the white-handed gibbons that I saw in Thailand. This one, also known as the Bornean agile gibbon or southern gibbon, was photographed on my trip to Indonesia back in 2009. He was hanging around a troop of orangutans in Tanjung Puting National Park and was rather habituated to the presence of people in the area.
Nikon D300 with Nikkor 200-400mm lens (at 360mm) ISO 800, f/4 at 1/250th of a second