Deinosuchus is an extinct genus of alligatoroid crocodilian, related to modern alligators and caimans, that lived 82 to 73 million years ago, during the late Cretaceous period 10.6 meters (35 ft) in total length, its overall appearance was fairly similar to its smaller relatives. It had large, robust teeth built for crushing, and its back was covered with thick hemispherical osteoderms.killing and eating large dinosaurs, even T-rexes .Ambushed hunter,have been able to perform a "death roll"