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//Iguanodon// was a big herbivore, the largest species growing to about 9 metres. It had a turtle-like horny beak at the front of its mouth which was ideal for cropping vegetation. At the back of its jaws numerous teeth were arranged in parallel rows. It was one of the first known dinosaurs to be able to chew. It had a hinged upper jaw, that was able to flex from side to side. This meant that its upper teeth could grind over the lower ones as it bit down hard. Reptiles generally cannot chew their food like mammals because they don't have the special muscles to move their lower jaw from side to side. Iguanodon was no exception, but with its hinged jaw it still managed to chew very effectively in its own unique way.