The bonobo is found only in lowland rainforests along the south bank of the Congo River in the Democratic Republic of the Congo. Closely resembling the chimpanzee in both physical appearance and mode of life, the bonobo is more slender, with longer limbs, a narrower chest, and a rounder head with a less-protruding face. Bonobos are not much smaller than chimpanzees—males weigh around 39 kg (86 pounds) and females about 31 kg, but both are the same height, standing 115 cm (3.8 feet) tall when erect. Unlike chimpanzees, bonobos do not hunt monkeys but instead play with and groom them. Furthermore, the phenomena of infanticide, cannibalism, and lethal invasion seen among chimps have never been observed among the bonobo. Relationships between separate communities also differ—individuals often intermingle. Adult males do not intermingle but, unlike chimpanzees, are not hostile. Bonobos sometimes mate in a face-to-face position, which is rarely seen among chimpanzees. The above is from the article "bonobo", Encyclopædia Britannica. Retrieved January 19, 2005, from Encyclopædia Britannica Premium Service. <http://www.britannica.com/eb/article?tocId=9080635>

Bonobos tend to darker skin tones (more melanin) and engage in coitus much more frequently.