Fossilized stomach remains are extremely rare, and coprolites are hard to match up to a particular dinosaur. Flowering plants evolved during the Cretaceous period. Carnivorous dinosaurs usually had long, strong legs so thay they could run fast in order to catch their prey. They also needed big, strong jaws, sharp teeth and deadly claws that could kill and then tear apart the prey. Good eyesight, a keen sense of smell, and a large brain to plan hunting strategies are also very important for successful hunting.
Most carnivores are scavengers when given the opportunity.
Some dinosaurs were fish eaters, including Baryonyx and Suchomimus . Velociraptor , Yangchuanosaurus , and many others. Some examples of omnivores are Ornithomimus and Oviraptor , which ate plants, eggs, insects, etc. Recently, in Canada, a large coprolite was found that probably came from a T. rex . The coprolite contained crushed bones, indicating that T. rex crushed the bones of its prey and did not simply swallow things whole.