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(a) A juvenile male capuchin uses a hammerstone to crack open a T. catappa endocarp on a stone anvil. (b) An adult male after cracking open a T. catappa endocarp on a wooden anvil. (c) Juvenile male capuchin observing an older juvenile processing T. catappa endocarps with a hammerstone. (d) Juvenile male about to process T. catappa—note prehensile tail used for support.
