绰号达科他的恐龙是一个只有5个自然保护恐龙化石(的群落)发现。
While the scratches told the scientists how the animal may have chewed, the lack of pit marks on the teeth suggested what the hadrosaur was eating.这些纹路能告诉科学家们这些动物可能是怎样咀嚼食物的，而牙齿上并没有坑坑洼洼的小坑，这个迹象告诉我们鸭嘴龙吃什么。
The cause of hadrosaur cancer remains a mystery today, but dinosaur fossils are helping unlock secrets of diseases millions of years old. Who knows what else they'll reveal.鸭嘴龙的癌症病因至今还是个谜，但恐龙化石帮助我们揭开了隐藏了百万年之久的秘密。谁知道它们还会揭示什么呢。
