Imagine a beast with hundreds of teeth packed into its giant beak. Scientists in America have just discovered the remains of a dinosaur with this fearsome feature. The creature — called Gryposaurus monumentensis — roamed the earth up to 80 million years ago. It had two legs and was around 30 feet long. Scientists say it had 300 teeth in his beak and hundreds more in its jaw, which were waiting to grow through when the others got worn out.