Everybody Wins

http://commons.wikimedia.org/wiki/File:Bottlenose_Dolphin_KSC04pd0178.jpg

The fishermen of Laguna in southern Brazil have a unique arrangement with local bottlenose dolphins. A pod of dolphins will drive fish toward the beach, where fishermen stand in the surf. When they see a dolphin roll over, the men throw out their nets, and the dolphins eat the escaping fish.

No one trained the dolphins to do this. It’s been going on since at least 1847.