Boto Ball Play, Rio Negro, Amazon, Brazil. A male Amazon river dolphin, or boto, throws around a macucu nut, watched by other botos – possibly pure showing-off. Ball‑throwing seems to occur mainly among groups of adult males as a sort of aggressive competition. Any object will do, a branch, a ball of mud, or even a turtle. (Photo by Kevin Schafer/Unforgettable Behaviour/NHM)
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