If I'm understanding the question correctly, then birds have a number of ways that their bodies have adapted to allow for flight. Some of these would include hollow bones, an enlarged breast bone, rigid skeleton, beaks instead of jaws (less heavy than jaws), and feathers (allows for a more streamlined body).
Flying takes a great deal of energy, which means that birds have a very high metabolism. This leads to a great deal of their time not flying spent eating in an attempt to get enough energy to allow for more flight.
To start flying, they use their legs to propel themselves forward just like we do while diving into water.
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Past tense: The flock of birds was flying. Present tense: The flock of birds is flying. (flock is a collective noun)
Birds feel colder when they are flying
Chickens can fly , but they are low flying birds.
Flying birds are not always larger. There are many bats bigger than many kinds of birds.
Birds Flying Away was created in 2000-01.
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Humming Birds
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.
Noel Gallagher's High Flying Birds was created in 2010.
A Flock of Birds means a lot of bird flying together
Birds fly every day. If you have seen a unusually large amount of birds flying, they could be migrating birds passing your area.
Birds are for alot of things like flying, and singing. Don't insult birds!