why does birds need to fly??

Question

your answers doesn't answer my question... and somehow many if you are so literal

Answer 1

The anatomy of the bird allows it to fly just as our anatomy allows us to walk upright. The following characteristics need to be present for these animals to fly: Each part of its anatomy is modified in some way to allow it to keep its body light and energetic for flight.
Very active metabolism. They can eat, digest, and eliminate the waste in a short amount of time. Their body temperature is rather high 102-103 degrees F. They are endotherms.
They contain a four chambered heart.
Their skeleton is constructed of light weight bones supported by an inner meshwork of bony material to give extra support while flying.
The female loses one of its ovaries.
They have no teeth and their beak is made of a light protein keratin.
They contain feathers, also made of keratin. There are three types of feathers: down feathers which are used for insulation, contour feathers which are colorful and used for recognition, and keeping the body aerodynamic, and quill feathers which are used for flight . These feathers are lost periodically (molting).
They have an extensive air sac system attached to the lungs. This reduces the weight of the bird and supplies the needed air for a fast metabolism. It also is used to dissipate the tremendous amount of heat built up from metabolism.
They have a well developed nervous system. Acute vision, and external ears.
Well developed muscles. The keel ,a part of the sternum, allows large pectoral muscles to be attached to the skeleton.
Their forelimbs are modifies as wings.

Answer 2

Not all birds fly. Ostrich, kiwi, penguins and many other birds do not fly. But all birds have feathers. Feathers originally evolved as a means of thermoregulation. Serendipitously, feathers also had aerodynamic properties which some feathered species took advantage of for adaptive reasons.

Answer 3

For those species that can, most are MADE to fly. E.G. they are raised in a nest with some relative altitude. For these birds, instinctual they must fly to LIVE.

Answer 4

Flying is the most efficient way of getting around. Most land species on earth fly.

Answer 5

remember, not all birds do fly, but mainly, the ones who do, do so because the evolved the ability in order to do two things:
1. escape predation
2. to hunt

Answer 6

Because it will be very difficult for them to cover such huge distances by walking. You can take your own example: why do you need vehicles? Why do you need airplanes to go to America?

Answer 7

they ned to fly to be able to find food, and to escape from other animals, birds need space

Answer 8

So they can migrate to a warmer country in the winter

Answer 9

they dont need it, it is what they can do for locomotion, it is thier nature they have to fly.
if they have eyes, they see, dont need to see
they have ears they listen, dont need to listen
they have wings they fly so why they shoul need to fly

Answer 10

Birdies fly so that we can fly too.