The fulmar flying free

"Guides to bird-identification say that, superficially, it is like a gull. The word "superficially" should be emphasized, however, because it is quite unlike a gull to the eye of any praticed observer. As a flying machine, especially, it belongs to an altogether different category. It is a projectile rather than a parachute, adapted to swift rather than drifting flight."

The Storm Petrel and the owl of Athena, II, Louis J. Halle