of a gorilla, but other morphological measurements are like those of chimpanzees. Only one of the many skulls found at Bili had a sagittal crest, thus it cannot be considered typical for the population. Female Bili apes have genital swellings similar to other chimpanzees, although Williams claimed otherwise. Behavior According to Williams, the apes howled at the Moon. Hicks and Ammann disputed that. According to Hicks, in some ways, the apes behave more like gorillas than chimpanzees. For example, they build ground nests as gorillas do, using interwoven branches and/or saplings, bent down into a central bowl. However, they frequently nest in the trees as well. Often ground nests will be found beneath or in proximity to tree nests. Their diet is decidedly chimpanzee-like, consisting mainly of fruits (fruiting trees such as strangler figs are visited often). Hicks observed one group far from the roads and villages in 2004, saying that when they encountered it, the chimps not only approached the humans, but also would actually surround them with intent curiosity. Hicks found the behavior toward humans intriguing. They would come face-to-face, stare intently, then slide away quietly. There was little to no aggression, yet no fear, either. "Gorilla males will always charge when they encounter a hunter, but there were no stories like that" about the chimpanzees, according to Ammann. Hicks clarifies Williams' claims as follows: the apes within roughly 20 km of the roads flee humans almost without exception. The adult males show the greatest fear. Further from the roads, however, the chimpanzees become progressively "naive". Even though these apes avoid the camera, they seem to have a curious nature. It has been observed that, when these chimps find humans around, they don’t just approach humans, but circle them out of pure curiosity. The chimpanzees would stand face to face and exchange longing glances. Distribution Bili is a city, and a river tributary, which lies in the Democratic Republic of the Congo's far north, about 200 kilometres east of the Ebola River. It lies to the north of the Uélé River, to the south of this river lie deep tropical rainforests, whereas around Bili lie wetlands and the forests are broken by patches of savanna. Civil war and neglect had left the region relatively undeveloped and wild, with people still using home-made guns of ancient design in 2005. Chimpanzees were also tracked by Ammann in the region near