text1: Researchers are aware that chimps have used similar methods in the past, but it was not fully known if the tools they used were designed specifically for the task of gathering the insects. Of all the tools the chimps left behind and Sanz's team recovered, 80% were custom made by their owners. Sanz says the new study has determined that their methods have since evolved, proving previous hypotheses.
text2: Chimps design tools to catch termites.