on shoulders. See video. L 112 leave leap bipedal Adult male stands upright, swings body forward and back, to gain momentum, then jumps from rock to rock in upright posture when crossing stream on stepping stones. Absent in bonobos of Wamba. leap bipedal with squared shoulders Adult male with arms half-raised jumps bipedally up and down repeatedly facing another male doing same. Threatening gesture in adult males and females. 7. See video. leap down Goodall Vertical leap: Leap vertically from one structure to another. Leap from tree down to vegetation or ground during play, at start of departure, or when chased. Infant leaps down from mothers back to ground. Cf. fall and drop self. Kanos Vertical leap for bonobos. See video. leap down and wait As mother travels,