The external structure is the wing. Its bones are so not heavy that the wind takes the bird up and allows it to fly.
wings
Birds fly to avoid predators. Some have protective coloring.
Yes. It helps by tucking into the birds body. Inside their legs and feet is a structure to help them fly.
they are 3 feet weighs 44lb cant fly
firs because they have hallow bones that allows them to fly and so they can get away from things that will try to eat them
Birds fly in a V-shaped pattern to conserve energy by taking advantage of the upwash of air created by the bird in front of them. This formation reduces air resistance and allows the birds to fly more efficiently over long distances.
It's wings and the bone structure in them help the eagle, and all birds actually, to fly.
It is not only birds that fly. Bats fly and they are not birds.
Birds have feathers, wings, and strong yet lightweight bones which help them fly. Their unique skeletal structure allows for efficient flight by reducing overall weight while maintaining strength.
Its wings, its light, fragile skeleton, and its feathers
Hollow bones in birds reduce their weight, making it easier for them to fly. This lightweight structure also allows for efficient oxygen distribution within the bones, which aids in maintaining high metabolism needed for flight. Ultimately, hollow bones contribute to the bird's overall agility and maneuverability in the air.
im not sure if they have an extra air sack but if they do its because birds fly very high and they is not much oxygen up where they fly, plus i do know they have a light bone structure.