and contusions. Also stamp softly on playmate repeatedly in social play. Also in bonobos. 2. See video. stamp quadrupedal 179 stamp quadrupedal Stamp quadrupedal on ground, rock, buttress, tree trunk, wall of house, another, or carcass of animal. Component of charging display, etc. Juveniles stamp on rock or lying adult in play. Absent in bonobos? Category 3. See video. See also video pant-hoot. stamp trot van Hooff: The animal walks or trots along while stamping heavily with its hind feet on the ground. Often this is done in a rhythmical manner in that one foot is placed down gently and the other with force. The head is mostly kept rather low and tucked back between the shoulders which are pulled upwards. The head may make low amplitude vertical