In the 1960s a young Englishwoman made a discovery that changed our understanding of animal behaviour. Jane Goodall was living among wild chimpanzees in Tanzania when she observed them using sticks and grasses as tools to get food. Farhana Haider spoke to her about her life in 2014.
This programme is a rebroadcast.
(Photo: Jane Goodall with chimpanzeess. Credit: AFP)