The largest flying dinosaur, and also the largest flying creature to have ever lived, is believed to be the pterosaur known as Quetzalcoatlus. Quetzalcoatlus was a pterosaur from the Late Cretaceous period, approximately 68 to 66 million years ago.
There are several species of Quetzalcoatlus, and they are part of a group of flying reptiles called pterosaurs. These ancient creatures had a unique wing structure supported by a long fourth finger, which allowed them to be excellent gliders and flyers.
The size of Quetzalcoatlus varied among species, but the largest of them, Quetzalcoatlus northropi, is estimated to have had a wingspan of about 10 to 11 meters (33 to 36 feet) and a standing height of up to 5.5 meters (18 feet). The weight of these giant pterosaurs is estimated to have been around 200 to 250 kilograms (440 to 550 pounds).
Quetzalcoatlus was an awe-inspiring creature, and its size and flying abilities make it one of the most remarkable members of the extinct pterosaur group. As with many other dinosaurs and prehistoric creatures, our understanding of Quetzalcoatlus and other pterosaurs is continually evolving as new research and discoveries are made.