by chimpanzee at Bossou M make night bed Goodall Night nest. Plooijs Nestbuilding. Evening bed-making is common characteristic of great apes. Durable sometimes for more than months 2. See video. make sound Produce audible sound by exerting force on external object. Includes clip leaf, drum, rap, slap, splash water, stamp, etc. Cf. vocalize. make tool Modify natural object, so that it serves more effectively. At Mahale, this is limited to a few patterns. For example, make probe for fishing for carpenter ants: peel bark and cut it to appropriate size, use twig by removing leaves and small branch, remove leaf-blade and use mid-rib, etc. Also bend branches or shrubs for bed-making and courtship. Many other tool-making behavioral patterns seen at other sites. See video. male invite See open