Red Howler Monkey, Madidi National Park, BoliviaThis is a male red howler monkey that I met years ago in the Bolivian Amazon. I was in a canoe on Lake Chalalan in Madidi National Park when I watched a troop of red howlers, as well as a troop of squirrel monkeys settling in for the night. This big guy seemed particularly pleased with the spot he found in the V (or is it a Y) of that tree.
Nikon D300 with Nikkor 200-400mm lens (at 400mm) ISO 1600, f/4 at 1/100th of a second