Black Bird Clipart Me. When a bird flaps as opposed to gliding its wings continue to develop lift as before but the lift is rotated forward to provide thrust which counteracts drag and increases its speed which has the effect of also increasing lift to counteract its weight allowing it to maintain height or to climb Flapping involves two stages the down stroke which provides the majority of the thrust and the up stroke which can also depending on the bird s wings provide some thrust At each up stroke the wing is slightly folded inwards to reduce the energetic cost of flapping wing flight Birds change the angle of attack continuously within a flap as well as with speed.
Birds use flight to obtain prey on the wing for foraging to commute to feeding grounds and to migrate between the seasons It is also used by some species to display during the breeding season and to reach safe isolated places for nesting Flight is more energetically expensive in larger birds and many of the largest species fly by soaring and gliding without flapping their wings as much as possible Many physiological adaptations have evolved that make flight more efficient Birds that settle on isolated oceanic islands that lack ground based predators often lose the ability to fly This illustrates both flight s importance in avoiding predators and its extreme demand for energy
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