Bat wings are like hands: meaty, bony and full of joints. A new study finds that bats take advantage of their flexibility by folding in their wings on the upstroke to save inertial energy. The ...

Birds fly more efficiently by folding their wings during the upstroke, according to a recent study. The results could mean that wing-folding is the next step in increasing the propulsive and ...

Bats get around their lack of feathers and a tail by generating two vortices of air that help overcome air resistance when flying, a new study shows. Bats face a unique problem when they fly: ...

PROVIDENCE, R.I. [Brown University] — Whether people are building a flying machine or nature is evolving one, there is pressure to optimize efficiency. A new analysis by biologists, physicists, and ...