They may instead have used their long teeth to dig and chop, in the same way that beavers do, says Paul Barrett, a dinosaur expert at the Natural History Museum, London.

• 它们可能像海狸那样通过用长牙掘土和削劈来获取食物，伦敦自然历史博物馆的恐龙专家鲍尔·巴勒特说。