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Its a survival strategy for the fish, with apparently each fish taking turns on the outside. According to David Attenborough....the fascinating thing about the birds in the OP is the way the formation splits and merges and and appears to put on a choreographed show.
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Stuart
War crimes will be prosecuted. War criminals will be punished. And it will be no defense to say, 'I was just following orders.' George W. Bush
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