[Meat Eaters]
Read about some meat-eaters.

All the meat-eating dinosaurs belonged to the group called Saurischia (sub-group Theropoda). This group included meat-eating biped dinosaurs like the Allosaurus and Tyrannosaurus.

Mice Eaters?

Although the ancestors of mice lived at the same time as the dinosaurs did, real mice and other rodents didn't appear until 10 million years or so after the dinosaurs died out. So, dinosaurs couldn't have eaten mice.

However, there were strange rodent-like mammals around called multituberculates, which small theropods such as Troodon probably hunted.

Cannibals

When scientists found 12 young Pinacosaurus in the gobi Desert, it was clear that two theropods, Velociraptor and Saurornithcides, had been feeding on them. They had even left behind some of their teeth. Velociraptor had turned up before in the Gobi Desert, locked in mortal combat with Protoceratops. Velociraptor had obviously attached it, which in defence had clamped its jaws around Velociraptor's arm.