Quetzalcoatlus

this is the skelton of the largest flying animal ever to live on earth, Quetzalcoatlus was a  pterodactyloid pterosaur estimated from the Late Cretaceous of North America and the biggest Quetzalcoatlus fossils came from an individual with an estimated wingspan as large as 15.9 meters (52.2 feet) but more recent fossils suggest to have a wingspan of about 10–11 meters (33–36 ft).  Mass estimates for the Quetzalcoatlus are very problematic because no existing species share a similar size or body plan, so far, to the quetzalcoatlus. While some studies have historically found extremely low weight for Quetzalcoatlus, as low as 70 kilograms roughly (150 lb) for a 10-meter individual specimen, more fossils that have been found and have been published since the 2000s have been higher, around 200–250 kilograms (440–550 lb). The Skull material that has been collected throughout past years (from the unnamed smaller species that have not been found much) shows that Quetzalcoatlus probably had a very sharp and pointed beak for its feeding habits, contrary to some earlier reconstructions that showed a les sharp snout (beak), based on the jaw material from another pterosaur species, possibly a tapejarid or a fossil related to Tupuxuara. A skull crest was present on the Quetzalcoatlus but its exact form and size are still unknown to science but it was most likely used for displays to the other gender during mating season or maybe other reasons, like the fact that Quetzalcoatlus was a glider and didn't use its wings often only for take off which was also difficult because of its weight so it wasnt very graceful on the ground since it was the same height as a giraffe and easily ate other smaller dinosaurs as its general diet and in the air was roughly the same size as a small plane.