Predatory dinosaurs from this time period included the tyrannosaurids `` Tyrannosaurus , '' `` Dryptosaurus '' , and `` Nanotyrannus '' ( which may just be a juvenile of the former ) , and the troodontid `` Troodon '' .
Predatory dinosaurs from this time period included `` Tyrannosaurus '' and `` Nanotyrannus '' ( which may just be a juvenile of the former ) , and the troodontid `` Troodon '' .