Flying insects, such as flies, butterflies, and dragonflies, have thin, membranous wings that they move by altering their body shape. Birds possess strong wings made of bone and muscle ...

The finding is the second such specimen that scientists have found with membranous wings. These two discoveries seem to confirm the notion that there was an entirely different evolutionary track ...

Paleontologists continue to discuss the possibility of their even earlier presence in the common ancestor of dinosaurs and pterosaurs (the first flying vertebrates with membranous wings ...