Birds fly in circles for various reasons.
Birds that fly in a V formation carefully position themselves, and time their wing flapping, so they can draft off the bird in front of them. This helps them conserve energy, sometimes by as much as 70%. During flight, the birds at the tips and in the front of the V swap positions at regular intervals to cut down on fatigue.
The bird at the front of the chevron is usually the strongest flier of the group. The birds flying behind it then have an easier time flying by riding the lead bird's wake.
I don't really know but i think it is natural to fly like that mainly because they're wings are in that shape so they don't fall to the ground and stay up right.
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No.
Any V-shape can be called a chevron or a wedge. I've heard TV wildlife commentators - such as Sir David Attenbrough - use "v-shape" in their voiceovers.
A chevron is a V shape.
Only a chevron has diagonals intersecting outside the shape. The diagonals of a symmetric chevron will intersect at right angles.
It is not only birds that fly. Bats fly and they are not birds.
Two or three.
A polygon is a closed figure made of line segments. Therefore, a chevron is a polygon, specifically one that is concave.
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Most birds can fly. Not all.
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.