Because if they didn't fly they would have to walk
Because its too far to walk when migrating.
It is not only birds that fly. Bats fly and they are not birds.
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.
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.
Birds do not fly all the way to the southern hemisphere, they fly to the equator.
maybe but how birds fly birds fly by using there wings becuse feather make the birds fly bye love u by your boyfreaind or girlfreaind
birds fly in the troposphere which is the lowest layer of the atmosphere.
birds can fly because they have such small, light bones in their wings.
birds fly into space due to their hollow bones