In the Democratic Republic of the Congo, scientists have discovered a new species of monkey--only the second in the last 28 years. The lesula is a guenon, a genus of Old World monkeys found exclusively in sub-Saharan Africa, and while guenons are very common, the lesula was unknown to western science until a chance meeting in 2007. A scientific team happened to find one being kept as a pet, leashed to a fencepost. It was known quite well to hunters of the area, but the scientists had never seen it before, hence discovery. Like the other guenons, it's a smallish, forest-dwelling monkey, preyed upon by leopards, humans, and chimpanzees.