The most dangerous dinosaur that ever lived was the Tyrannosaurus Rex.
Other dangerous dinosaurs that were considered the most dangerous other than the Tyrannosaurus Rex were, Troodon, Mapusaurus, Velociraptor, Utahraptor, Spinosaurus,Carcharodontosaurus and the Majungasaurus.
Crocodiles are the closest animal to a dinosaur.
The closest animal to a dinosaur that is living today is the Crocodile.
When it comes to dinosaurs the dinosaurs are in the group of reptiles and crocodiles fit that criteria.
Other animals that are closest to dinosaurs are birds, chickens, chicken hawks, ducks, Shoebill Storks, Lizards and even snakes.
Although the larger dinosaurs have gone extinct there still are some dinosaurs that roam the earth although they are just smaller.
When you see Crocodiles, birds, ducks, etc you are actually looking at a small version of a larger dinosaur that existed all those years ago.
So dinosaurs still do exist but just smaller.