An adult female chim­panzee trans­fers her fish­ing probe to her off­spring, who has been try­ing unsuc­cess­fully to ter­mite fish with a dif­fer­ent fish­ing probe. The adult female mod­i­fies the probe her off­spring has dis­carded and begins to use it her­self. (Video: Cour­tesy of Goualougo Tri­an­gle Ape Project.)

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