Modern birds capable of flight all have a specialized wing structure called the propatagium without which they could not fly. The evolutionary origin of this structure has remained a mystery, but new ...

New research on a four-winged dinosaur reveals it was secondarily flightless, with a wing structure and molting pattern.

In front of us was a dinosaur skeleton the size of a large dog. It was obviously a dinosaur, as it had the reinforced pelvis, ...

“Awkward” would probably be the most benevolent word I could use to describe the explosive launch into flight of the California quail. Certainly, the words graceful or athletic do not come to mind. A ...

The common swift is an astonishing bird, capable of spending up to 10 months in the air without landing. This remarkable ...