CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Plesiosaur dinosaur. Artwork of a long-necked marine dinosaur (plesiosaur) hunting a shark in a shallow sea. Plesiosaurs ("ribbon reptiles") had a relatively small head with a mouth lined with teeth. It was probably a fish-eater, using its neck to throw its head forward at prey. It was propelled through the water by four powerful paddle-like limbs which it flapped up and down like the paddles of a modern-day turtle. Plesiosaurs probably came ashore to lay their eggs. Dinosaurs lived during the Mesozoic era (65-225 million years ago).
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