Abstract 10.1002/zoo.10064.abs Two types of tool use were shown by a captive bonobo (Pan paniscus) in a large outdoor enclosure at Apenheul Primate Park in The Netherlands. A wild-born young adult female (estimated to be 9 years old) used fallen branches as ladders to bypass protective sheaths to gain access to trees. Later she used a branch as a weapon to beat to death a peahen (Pavo cristatus). None of the other bonobos in the group were seen to use branches as either ladders or weapons. Zoo Biol 21:607–611, 2002. © 2002 Wiley-Liss, Inc.