researchers are aware that chimps have use similar materials in the past , but it was not precisely decided if the plants they used were made specifically for the role of picking the animals . of all the tools the gorillas left behind and saavedra ' s team recovered , 80 % were originally made by their owners . sanz claims the new study has clarified that their methods have significantly developed , demonstrating previous hypotheses .
Chimps design tools to catch termites.