First of all that’s a Pteranodon not a Pterodactyl that’s like calling a pelican a seagull.
But anyway Quetzalcoatlus was basically a flying bear-stork that also pole vaulted into the air

(Which is how almost all Pterosaurs got into the air)
It's basically awesome. Its European cousin Hatzegopteryx (Which may or may not be a species of Quetzalcoatlus) was around the same size as Quetzalcoatlus but some say it may have been bigger! Hatzegopteryx may have even been a little more terrifying as it had a more hefty skull that meant it became more of a apex predator like T.rex, hunting down buffalo sized prey. This is due to Europe being nothing but island chains at the time and meant that Dinosaurs had to become smaller due to lack of food. Hatzegopteryx remained big probably because it could simply fly to different island if need be.

You just have to love how the sillouhette guy is running like a mother fucker in that last image.