What dinosaur would the Tyrannosaurus rex have been afraid of?

Like all predators, it would have an appropriate fear of anything that would be capable of inducing a fatal injury. Predators are not fearless: even if you win a fight, the aftermath includes infections and other nasty things. read more

Outside of dinosaurs, Tyrannosaurus juveniles would have been afraid of any of the larger crocodiles of the day (which reached probably 15 feet, so no danger to adults), and of giant pterosaurs, as Quetzalcoatlus is believed to have hunted hatchling dinosaurs. read more

It's difficult to infer a dinosaur's life span from its fossil remains, but based on an analysis of existing specimens, paleontologists speculate that Tyrannosaurus Rex may have lived as long as 30 years--and since this dinosaur was on the top of its local food chain, it would most likely have been felled by old age, disease, or hunger rather than attacks by its fellow theropods, except when it was young and vulnerable. read more

Tyrannosaurus rex(tyrant lizard king) is one of, if not the largest, terrestrial carnivores of all time. Dubbed the king of dinosaurs, T.rex strikes fear into the hearts of many. Tyrannosaurus lived in North America roughly 65-70 million years ago. read more