Albertosaurus fed on horned dinosaurs, duck billed dinosaurs, and even the armored Ankylosaurus.

阿尔伯特龙进食带角的恐龙、鸭嘴龙甚至披盔戴甲的甲龙。

By the late Cretaceous, the Iguanodons had been replaced by the duck billed Hadrosaurids like this Prosaurolophus here.

到白垩纪晚期，禽龙已被像这里的原蜥龙这样的鸭嘴鸭嘴龙科动物所取代。

First group includes the duck billed hadrosaurs and their earlier relatives the and a variety of small somewhat nondescript plant eaters.

第一组包括鸭嘴鸭嘴龙和它们的早期亲戚，以及各种有点不起眼的小型植食者。

Here is the femur of a hadrosaur or duck billed dinosaur and the spot where the caudofemoralis attaches is easy to identify.

这是鸭嘴龙或鸭嘴龙的股骨，尾股肌附着的位置很容易识别。