The largest animal to ever fly was the pterosaur known as Quetzacoatlus, which had a forty foot wingspan and was as tall as a giraffe when it walked on all fours. If it still lived, I can imagine some people would mistake this animal for a dragon. As you can see in the picture above, Quetzacoatlus could kill a grown man with a single peck of its long beak. On the other hand, this pterosaur could also snatch a grown man off the ground like a hawk snatching a field mouse. I am thinking of featuring a creature that is as big as Quetzacoatlus in my dinosaur series.