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Aralosaurus: Aralosaurus was an early duck-billed dinosaur with a low bulge in front of its eyes similar to Hadrosaurus'. Aralosaurus had loose skin on its snout, which it could inflate like a balloon. When it exhaled, the air from the ballooned skin magnified its low-frequency bellowing call. It used its call to warn predators to stay away or to attract females. Aralosaurus had a broad, toothless beak for cropping twigs, leaves and flowering plants. Its jaws contained hundreds of grinding teeth. Duck-billed dinosaurs had more teeth than any other type of dinosaur. A relative of Maiasaura, Aralosaurus also travelled in herds for protection and created communal nesting grounds to care for its young.