I mean, flights of birds are quite complex, but these were words.

His main interest was in aviation, the problems of bird flight.

In the distance there was a flight of birds, south, away from the guns.

It seemed to have no more to do with us than a flight of birds.

He waved his hand in the air as if describing the flight of birds.

For example, he studied the flight of birds to find means by which humans could fly.

It arises in the flight of both aircraft and birds.

Overhead, a flight of birds was passing across the forest.

He'd look, I don't joke, at things like the flight of birds.

Finally, theories on the evolution of bird flight are discussed.