A pair of Quetzalcoatlus engage a T. rex guarding an Alamosaurus carcass…

A confrontation between two of North America's top, yet highly contrasting terrestrial hunters, Tyrannosaurus rex and Quetzalcoatlus northropi…

One is a heavy, muscle-packed, heavily armed theropod, sporting a strong bite force and bone crushing teeth, tools that enabled it to hunt and maim equally large and dangerous herbivores, such as Edmontosaurus, Triceratops, and sometimes Ankylosaurus…

The other is a very large, lightweight, predatory azhdarchid equipped with powerful wings that enabled it to not only actively fly, but also allowed it to swiftly move on the ground like a giant vampire bat as it ran after anything it could catch and swallow whole…

Oh, and there’s two of the latter…

This scene did a good job showing how T. rex was not the usual relentless murder machine we see on the big screen, but a calculated animal that could determine if something is worth fighting over, especially if it encountered the only other local, giant carnivore that could counter its might: Quetzalcoatlus…

Note: Despite living on the same continent during the same temporal range, there is currently no fossilized evidence of these two animals interacting at all. The behavior Prehistoric Planet gave them is educated guesswork from renowned biologists and paleontologists who came together to formulate how all of the animals in the show would live both from their fossilized remains and behavior from contemporary animals…

To quote Darren Naish (lead paleontologist consultant) regarding some of the speculative animal behaviors mimicking living animals:

"It is an extrapolation to show (behaviors of living animals) in an extinct dinosaur/animals, but it's one that we can justify."

Sauce: Prehistoric Planet - S2 E5

(I do not own any of the content shown in this video and uploaded it for entertainment purposes only.)

00:00 The King Arrives
01:00 A Rival Descends
02:26 Angry Azhdarchids
03:12 The Tyrant Retreats