Chris Blattman

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Unexpected joint production functions

a pod of bottlenose dolphins drive fish towards fishermen who stand at the beach in shallow waters. Then one dolphin rolls over, which the fishermen take as sign to throw out their nets. The dolphins feed on the escaping fish. They were not trained for this behavior; the collaboration has been going on at least since 1847.

In Laguna, Brazil.

Source. Hat tip. Video:

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