Deinosuchus was possibly the largest crocodilian that ever lived, rivalling the perhaps slightly longer Sarcosuchus Imperator in size. It was an Alligator that lived around 80-65 MYA. It may have grown up to 15 metres long, and lived in what is now the USA and probably Canada. It would have weighed between 5 and 10 tonnes fully grown. Deinosuchus bite marks, have been found in the skull of a Daspletosaurus - a 9-10 Metre Long Tyrannosaurid that lived a little earlier than Tyrannosaurus rex itself.