also by adolescent females, juvenile males and adult males when a high-ranking individual passes. Sometimes as the dominant recipient of the gesture moves on, the bobber backs away in front of the dominant animal. This may provoke an aggressive response. Bobbing is accompanied by pant-grunts which may become rather frenzied pant-screams. Plooijs Bob. van Hooffs Squat bob. Absent in bonobos. See video. bob bipedal Like bob, but standing on feet only. See video. boredom Goodall Boredom. See kill time. B 38 B branch slap Bossou Study area of Pan troglodytes verus in southwestern part of Guinea. Research organised by Y. Sugiyama and T. Matsuzawa, continuing from 197 to present. Pioneer studies done by A. Kortlandt in the early 19 0s and his colleagues in 19 819 9. bounce