Atmosphere.
You call animals that fly in the air aerial locomotion animals. Such animals include most birds, bats and certain insects.
"If birds fly lowExpect rain and a blow."When the air pressure is high, it is easier for birds to fly at a higher altitude. If the air pressure is low, indicating bad weather, birds can't fly as high because the air is less dense. The barometer measures air pressure.
Birds fly in air. They use the air to fight gravity. When air travels faster along the upper wing than the lower wing, the air force down is less than the air force up -- really helps most birds. Gravity affects birds.
Birds can fly because they light feathers &they do not have bone marrow
Air pollution makes air thicker. Birds' wings need thicker air to help them fly. Polluted air helps bird fly better and find more food, nesting grounds etc. Air pollution is extemely helpful for birds.
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.
There are many reasons that birds fly the way they do. One reason for why they fly in a V formation is because it reduces the air resistance on the birds in the back of the formation.
Birds fly in the air by pushing their chest muscles and moving their wings up and down.
Pelicans at least.
They wouldn't be able to fly there at all, without air.
birds have wings and air-filled spongy pneumatic bones which helps them to adapt them to aerial life.its to fly about in sky
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.