A rare video shows the clever reptile turning on its side to make itself too big for the shark's gaping mouth.
Confusing the shark further, the turtle swims in tight circles to help it escape from the killer animal.
The turtle swims closely to the shark, not allowing it to turn quickly enough, as it circles the predator, using its shell as a shield.
The fascinating footage was shot off the Cocos Islands, near Costa Rica, by Randall Arouz.
Mr Arouz, from Florida, said: 'The turtles have to have certain strategies to avoid being eaten.
'Firstly, the shark will swim at it, mouth wide open horizontally and its teeth can puncture the shell.
To balance this, the turtle will turn on its side, creating a shield and making it too big for the jaws.
'Secondly, it stays near so the shark can't turn sharp enough to catch the turtle.'
(dailymail.com)
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