Theropods were a very different shape to sauropods.

Whereas sauropods could be huge and have barrel-shaped bodies with long necks and often whip-like tails, theropod hunters were much stockier, had two walking legs and two small 'arms', a short, stocky tail that could not be flicked and a large head.

Although you may read lots of things about hunters that seem to state facts, remember that hunting dinosaurs are still much of a mystery. For example, people use to think they stood upright all of the time, but recently it has been shown that they moved with their heads level with their tails for much of the time. It has also been thought that hunting dinosaurs were very fast, but now people are not so sure, especially when thinking about adult hunters. They may have got bulky and found fast moving more difficult.

Also remember that shapes are to do with what the animal needed in order to get its food. It needed sharp, dagger-like teeth to rip the flesh from a tough-hided sauropod. To get teeth that will do that, they have to be set in a heavy jaw with plenty of force. So the hunter would have needed big muscles in its jaw. But that is not at all the same as believing that hunters brought down their prey while running fast. They would have needed the same jaws just to rip apart a dead carcase, or to kill one that they had trapped by laying in ambush.

So, as you can see, we can be sure what the had was big and powerful for, but we cannot be sure how it was used in hunting, for there are several different suggestions that fill the bill.