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A pan African study has raised concerns over the effect of human influence and disturbance on Chimpanzee behaviour. Ammie Kalan of the Max Planck Institute for Evolutionary Anthropology says chimps are using tools less, and not passing on skills to younger generations as human settlements reach the areas where they live.

(Image: Two chimpanzees share fruit, Credit: Anna Preis/Ta茂 Chimpanzee Project.)