According to Cornell University, there are four common types of bird wing shapes. Passive soaring wings are found in birds such as hawks and bald eagles. They enable birds to catch columns of vertical air and rise higher while flying. Active soaring wings are found in birds such as the albatross. This wing shape grants birds the ability to soar for long periods of time. Elliptical-shaped wings are found in ravens and sparrows. This shape enables the birds to fly with short bursts of speed, although it doesn't let them maintain this speed. High-speed wings are found in ducks and falcons. These wings allow birds to fly incredibly fast for long periods of time.
http://animals.pawnation.com/anatomy-birds-wings-9411.html
http://ornithopter.de/english/gait.htm
