The reading and lecture discusses the topic, whether a mammal called R.

The reading and lecture discusses the topic, whether a mammal called R. robustus was a active hunter of dinosaurs according to remains of psittacosaur found in his stomach? The author believes that he was just a scavenger sometimes eat unhatched dinosaur eggs. On the other hand, the professor casts doubt on all of the points made by the author. He claims that the R. robustus was an active hunter and provides few reasons for his assumption. To begin with, the professor explains that R. robustus was an active hunter even though he was smaller in size. According to professor, he used to hunt baby psittacosaur and similar size dinosaurs. It is already known fact that R. robustus was twice bigger than the dinosaurs in his stomach. On the contrary, the article mentions that R. robustus was a scavenger hunter and was much smaller than psittacosaurs, so could not eat psittacosaurs. In addition, the professor gives example of modern mammal Tasmenian devil, who does not have legs just beneath the body, but can run much faster that is 15km per hour. Therefore, it is likely that the R. robustus could have run faster to prey on baby psittacosaurs. The author challenges this view point and states that R. robustus's legs were unsuitable for running faster and hunting. ON the other hand, the remains of animal found in R. robustus stomach was very fast runner. Finally, the speaker contradicts the point made by the author that there are not any teeth marks on the bones of the remains of hunted animal. But, as per speaker the R. robustus used to directly swallow it's prey rather than chewing, so no evidence of teeth marks are found on the bone of the hunted animals in his stomach. Additionally they never used hind teeth.