Pterosaurs and the evolution of powered flight

Pterosaurs were flying reptiles with a wing membrane supported by an elongated fourth finger. Their fossils reveal a diverse group, not flying dinosaurs.

Pterosaurs were the first vertebrates known to evolve powered flight. Their wings were formed by a membrane supported mainly by an elongated fourth finger, a structure unlike the feathered wings of birds. Fossils preserve a wide range of body sizes and skull forms, while soft tissue and trackways provide additional, uneven evidence about flight and life on the ground.

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Frequently asked questions

Were pterosaurs dinosaurs?

No. Pterosaurs were close relatives within Archosauria, but they were not members of Dinosauria. Birds, by contrast, are living dinosaurs.

What formed a pterosaur's wing?

A skin membrane stretched from the greatly elongated fourth finger toward the body and hind limbs. Fossils of soft tissue can preserve supporting fibres in some specimens.

Could every pterosaur fly in the same way?

Pterosaurs shared powered flight, but their sizes, wing proportions and likely flight performance varied. Reconstructions rely on anatomy and physical models, not direct observation.

What do pterosaur footprints show?

Trackways can preserve how an animal placed its feet and hands while walking. They do not, by themselves, identify a particular named species or reveal how it flew.