Thomas's Leaf Monkey, SumatraThe Thomas’s leaf monkey, also known as the Thomas’s langur, is one of the world’s least studied primates. They live only in Sumatra and their habitat has been getting smaller and smaller due mainly to deforestation for logging, pulp and paper and palm oil cultivation. They are also hunted by locals, so they were understandably skittish every time they saw me raise my camera to take a photo. This monkey pictured above was one of the more relaxed ones I saw, thanks to the protection of a nearby national park. Nikon D300 with Nikkor 200-400mm lens (at 400mm) ISO 800, f/4 at 1/250th of a second.