wings
The external structure is the wing. Its bones are so not heavy that the wind takes the bird up and allows it to fly.
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.
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
It is not only birds that fly. Bats fly and they are not birds.
Its wings, its light, fragile skeleton, and its feathers
Most birds can fly. Not all.
To say that birds use wings and feathers to fly, so all birds can fly, would be false. Not all birds can fly. An ostrich is an example of a bird that cannot fly.
Birds fly in a V formation to conserve energy and increase efficiency during long flights. The formation reduces wind resistance and allows birds to take turns leading, which helps them save energy by drafting off the bird in front of them.
The birds that can fly because it is easier for them to find food.
all birds fly xept penguins
Birds Fly South was created in 2001.
When the Birds Fly South was created in 1945.