Scientists have identified a new species of African monkey whose coloring "is unlike anything I've ever seen," as one of them put it. The monkey, known by people in the Democratic Republic of Congo as the lesula, has a blond chin and upper chest, in contrast to its dark limbs. It has a reddish-colored lower back and tail.

"And adult males have a huge bare patch of skin," on its backside, said researcher John Hart. "It's a brilliant blue, really pretty spectacular."

Hart is a field scientist with the Lukuru Foundation, a wildlife research group; his colleagues include his wife, Terese Hart. They reported their findings in the journal PLoS One.

The first lesula seen by researchers was the pet of a schoolgirl. It bore a strong resemblance to the owl-faced monkey, but the unusual coloring made the researchers suspect that it was something new. They were able to identify more lesulas in the wild and find hunters with specimens of the monkey. They analyzed tissue samples to confirm that the lesula -- short for its Latin name, Cercopithecus lomamiensis -- is in fact genetically distinct from other species.

The researchers found that the monkeys live in the central part of the country and have a range of about 6,500 square miles. The lesula lives in remote regions that are largely unthreatened by human settlement. But John Hart warned, "Under the current trends of uncontrolled bush-meat hunting, it could become very endangered."