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Animalia >Chordata >Mammalia >Primates >Cercopithecidae >Macaca >

Two juvenile individuals were on the tree, separating 3m from each other. One was resting. The other broke and detached a branch from a maple tree, approached and sat 1m from the resting one with the branch. Then the resting one ran to chase the branch holder, and the holder escaped. Finally, the holder dropped the branch.
In Arashiyama, "branch-dragging play" in which the holder of the object such as branch escapes and the non-holders chase the holder, is often observed. In the present case, the one who detached the branch obviously did not do so in order to feed it: Rather, it took the branch and approached the other, and promoted the other to play socially. Thus, the case can be understood in which a juvenile "produced" a tool for social play.

(Data No.momo050804mf01b)

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