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Investment in offspring competence. (Upper) A mother donates her tool to a begging offspring. (Lower) The offspring has begun to termite-fish. Following the tool transfer, the termite-gathering efficiency of the tool donor is depressed, as illustrated by the mother’s selecting a replacement tool in the second frame. Still frames reused with permission from ref. 45 and thanks to Stephanie Musgrave, Crickette Sanz, Dave Morgan, and Goualougo Triangle Ape Project.
