They don't, they use wings.
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.
It is not only birds that fly. Bats fly and they are not birds.
Birds use their wing muscles to spread out their wings when they are ready to fly. Birds use thermal air currents, updrafts, and wind to soar and flap their wings when needed.
their redbreast attract female birds who make themwant to fly more
Their wings cause they use it to fly by flapping it
Birds need to fly because they are the prey of many animals. They fly mostly when a carnivore is trying to eat them
Most birds use their wings for flight. Some of the flightless birds, or birds which do not fly much, may use their wings just for balance, especially when perching (e.g. chickens). For some flightless birds such as the kiwi, their wings appear to be without purpose.
Most birds can fly. Not all.
Birds use convection by using convection currents the heat will rise as a draft and then birds can ride the draft to reach higher altitudes.
Birds such as sparrows use their wings to push against the air, which enables them to fly.
The birds that can fly because it is easier for them to find food.
all birds fly xept penguins