Bird wing

Birds have wings to help them fly.

These wings have special feathers. The feathers help them move through the air.

Some birds do not fly. They might have very small wings. Other birds like penguins use wings to swim.

Bird wings have many bones. Some bones in the hand have joined together. This makes the wing strong.

Wing shapes are also different. Some wings are short and round. These help birds fly through thick trees.

Other wings are long. Long wings help birds fly for a long time.

Every bird has wings that fit its life.

Birds use wings to fly. These wings are paired forelimbs. They have special feathers. These feathers make lift and thrust. This helps birds move through the air.

Bird wings have many bones. The wing has a shoulder and a forearm. The hand is also changed. Some hand bones have merged together. These bones form the carpometacarpus. This is a single part made of merged bones. Three fingers are attached to it. One finger has an alula. These feathers act like the slats on an airplane.

Wing shape is very important. It helps a bird fly in its own way. Some wings are short and round. We call these elliptical wings. They help birds fly through thick trees.

Other wings are long and thin. These are high aspect ratio wings. They help birds fly for a long time.

Large birds like eagles use soaring wings. These wings have slots at the ends. These slots help the bird catch energy from the air. This makes it easy to glide for long distances.

A bird wing is a special pair of limbs. These limbs help birds move through the air. They use feathers to create lift and thrust. This allows many birds to fly.

Some birds do not fly at all. Land birds like the moa have very small wings. Other birds like penguins use wings as flippers to swim.

Inside the wing, there is a clever bone structure. It starts at the shoulder with the humerus bone. Next is the forearm with the ulna and radius bones. The hand is very different from a human hand. Many bones have merged to form the carpometacarpus. Three fingers attach to this part.

One finger has a group of feathers called an alula. These feathers work just like the slats on an airplane.

Scientists have studied these finger bones for 150 years. There is a big debate about which fingers they are. Some data says they are fingers 1, 2, and 3. Other data from embryos says they are fingers 2, 3, and 4. This is a strange mystery in science. Most likely, the finger buds follow a different genetic program. This makes the bones look like one set but act like another.

Wing shape changes how a bird flies. Elliptical wings are short and rounded. They help birds like the blue jay move through thick trees.

High-speed wings are pointed and short. Ducks use these for fast flight. The peregrine falcon is very fast. It can dive at 242 mph.

The spine-tailed swift has the fastest straight flight at 105 mph.

Other wings are built for long trips. High aspect ratio wings are long and thin. They help birds like the roseate tern fly for a long time.

Large birds like eagles or vultures use soaring wings. These wings have slots at the tips. These slots capture energy from the air to help the bird glide.

This makes it easier to find food over large areas.

A bird wing is a specialized pair of forelimbs used for movement through the air. These limbs possess unique feathers that generate both lift and thrust. This combination allows many bird species to achieve flight.

However, not all birds use their wings to fly. Some terrestrial birds, like the extinct moa, have reduced wings or none at all. Other birds, such as penguins, have evolved wings that function as flippers for swimming in aquatic environments.

The internal anatomy of a wing follows the basic structure of most tetrapods. It begins at the shoulder with the humerus bone. This connects to the forearm, which contains the ulna and the radius bones. The bird's hand is a highly transformed structure where many bones have merged or shrunk. Three metacarpal bones and some carpal bones fuse to form the carpometacarpus.

Three fingers attach to this fused structure. The most forward finger holds the alula, a group of feathers that functions like the slats on an airplane wing.

Scientists have spent about 150 years debating the identity of these finger bones. There is a discrepancy between different types of scientific data. Anatomical, paleontological, and molecular data suggest these are fingers 1, 2, and 3. In contrast, embryological data suggests they are actually fingers 2, 4, and 4. One likely explanation is that finger buds 2 through 4 follow the genetic program meant for fingers 1 through 3.

Wing morphology, or shape, determines a bird's specific flight capabilities. This shape represents a trade-off between speed, maneuverability, and energy use. Scientists measure this using two main parameters. The first is the aspect ratio, which is the ratio of wingspan to the mean chord. The second is wing loading, which is the ratio of the bird's weight to its wing area.

Most wings fall into one of four main categories.

Elliptical wings are short and rounded, which allows for tight maneuvering in dense vegetation. These are common in forest raptors like Accipiter hawks and many non-migratory passerines. Pheasants and partridges also use these for rapid takeoffs to escape predators.

High-speed wings are short and pointed. These are used by fast-flying birds like ducks. The peregrine falcon reaches a recorded dive speed of 242 mph (389 km/h). The spine-tailed swift holds the record for the fastest straight, powered flight at 105 mph (170 km/h).

High aspect ratio wings are long and narrow, providing high efficiency for long-distance travel. When paired with low wing loading, they allow for slow flight or hovering, seen in kestrels and terns.

Seabirds use these for dynamic soaring, which uses wind shear above ocean waves to create lift. Finally, large inland birds like eagles and vultures use soaring wings with deep slots. These slots are located between the primary feathers. They reduce induced drag and wingtip vortices by capturing energy from air flowing between the upper and lower wing surfaces.

Wing injuries can be devastating for birds that rely on flight. A broken bone or major injury can cause a wing to droop or sit in an unusual position. Such injuries often prevent birds from feeding, socializing, or escaping predators. In some cases, surgical amputations in birds of prey can lead to death. Interestingly, some small birds like the killdeer use injury as a survival tactic. A parent may feign a broken wing to lure a predator away from its nest. This behavior makes the predator focus on the parent rather than the eggs or chicks.