MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
The mosasaur is an extinct marine reptile that lived 70-65 million years ago. It had a long, barrel-shaped body, paddle-like flippers and a large heavy skull. It grew over 15 metres in length and weighed roughly 15 tons. In this image, the creature is seen with some prey, a turtle.
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