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Azhdarchidae · Late Cretaceous
Quetzalcoatlus northropi
/ket·sal·koh·AT·lus/ · "feathered serpent", for the Aztec god Quetzalcóatl
One of the largest flying animals that ever lived — a pterosaur the height of a giraffe that may have hunted on foot like a colossal stork.
illustration plate — standing pose, wings folded, ~5.5 m tall. Drop your reconstruction here.
Quetzalcoatlus is the animal people picture when they imagine a pterosaur pushed to its absolute limit. Discovered in the rocks of Big Bend, Texas, in 1971, it belongs to the azhdarchids — the last and largest family of pterosaurs, named for a serpent of Persian myth. With a wingspan of around eleven metres and a standing height to rival a giraffe, it sits at the very edge of what physics will allow a flying creature to be.
For decades, artists drew Quetzalcoatlus skimming the waves like a giant albatross. The modern picture is stranger and more compelling. Azhdarchids had relatively short, stiff wings, long stilt-like limbs, and enormous, spear-like beaks on the end of remarkably long necks. The leading interpretation today is that they were terrestrial stalkers — striding across Cretaceous floodplains on all fours like outsized storks or ground-hornbills, plucking up fish, baby dinosaurs, and other prey small enough to swallow whole.
An animal this size should not, by the intuition of birds, be able to take off. The answer lies in pterosaur anatomy: hollow, air-filled bones kept the skeleton astonishingly light, and the powerful forelimbs did double duty. Rather than running to take off, Quetzalcoatlus most likely quad-launched — crouching, then vaulting into the air off all four limbs in a single explosive leap, using the same massive flight muscles that powered the wing.
Once airborne, its size became an advantage. A creature this large could ride thermals and cover enormous distances on rising air with very little flapping — an efficient long-haul glider.
Quetzalcoatlus lived right up to the very end of the Cretaceous. Its fossils are among the last pterosaur remains in the record, found in rocks just below the layer marking the asteroid impact 66 million years ago. It was, in a sense, the last and greatest of its kind — the closing statement of 160 million years of pterosaur flight.