These dinosaurs were the forerunners of the bigger and more spectacular ornithischians like stegosaurus, ankylosaurus and the duck-billeddinosaurs.
这些恐龙都是更大更壮的鸟臀目恐龙，例如剑龙、甲龙和鸭嘴龙的先祖。
2
Much to their surprise, they found that only one group suffered from cancer-the hadrosaurs, or "duck-billed" dinosaurs. 29 benign tumors were found in the tail bones of 97 animals.