Bird wing

In aquatic flightless birds (penguins), wings can serve as flippers.

[1] Like most other tetrapods, the forelimb of birds consists of the shoulder (with the humerus), the forearm (with the ulna and the radius), and the hand.

Different shapes correspond to different trade-offs between advantages such as speed, low energy use, and maneuverability.

This type of wing allows for tight maneuvering in confined spaces such as dense vegetation.

They are also common in species that use a rapid takeoff to evade predators, such as pheasants and partridges.

This may take the form of almost hovering (as used by kestrels, terns and nightjars) or in soaring and gliding flight, particularly the dynamic soaring used by seabirds, which takes advantage of wind speed variation at different altitudes (wind shear) above ocean waves to provide lift.

These wings are favored by larger species of inland birds, such as eagles, vultures, pelicans, and storks.

The skeleton of a bird wing. Places of attachment of various groups of flight feathers are indicated.
The mute swan with outstretched wings
Wing of the white-tailed eagle
Wing skeleton. Highlighted in red: carpometacarpus and three fingers
Wing shapes
The short and rounded (elliptical) wings of the Blue Jay are adequate for short flights in densely-vegetated habitats.
A roseate tern uses its long wings (low wing loading and high aspect ratio) to fly economically for long periods of time.