Scientists have reconstructed how an ancient reptile swam in the oceans at the time of the dinosaurs.
Computer simulations suggest the plesiosaur moved through the water like a penguin, using its front limbs as paddles and back limbs for steering.
The creature's swimming gait has been a mystery since bones of the first known specimen were dug out of a Dorset cliff 200 years ago.
The plesiosaur was discovered by the fossil hunter Mary Anning in 1821.
At the time even the name dinosaur had not been invented.
A scientific paper unveiling Anning's find a few years later raised the question of how the marine creature swam, given its unusual pairs of wing-like flippers.
The debate has continued until today, with a computer simulation based on a Jurassic fossil specimen providing evidence in favour of penguin-like motion-READ MORE AND WATCH VIDEO ON BBC LINK-http://www.bbc.co.uk/news/science-environment-35115195
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