Quetzalcoatlus

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Quetzalcoatlus northropi

 Quetzalcoatlus

Quetzalcoatlus northropi, with a wingspan of 39 feet, is the largest animal that has ever flown. Quetzalcoatlus illustrates some of the difficulties paleontologists encounter in reconstructing lifestyle based on incomplete fossil bones.  Various studies have explored how, or even if, Quetzalcoatlus could have flown. Cretaceous Period, 65 million years ago, from Texas.