I stood gazing in wonder when a "V" flew past over me. Not actually a letter "V", rather a flock of birds in V formation. Still watching the beautiful scenery created by those birds in the sky, I noticed the one at the rear fly past others and replaced the leader.

That's awesome I said having realized they possibly continued to change position when the leader is weak as our winged friends continue their migration

Why do birds migrate?
Why do birds fly in V formation?
Why do they even prefer V shape?

Away we flock with them to find the answer...

Though not all birds migrate but more than half do. They are referred as migratory birds.
Reasons why birds migrate to a different habitat vary but shouldn't be far from availability of food or for survival purpose i.e they respond to stimuli such as changes in weather.

Flying in V formation is in fact a characteristic of migratory birds.
Reason; to save energy during their long journey.

Funny enough! birds migrate several kilometers away from their habitat. Don't be surprised why they mainly feed on grains because the grains provide the energy they burn up during their flight. Flying consumes a lot energy even a pilot can tell you that.

Thanks to nature that has this amazing feature bestowed to our winged friends to enable their aerial adaptation.

In the northern hemisphere, many birds migrate south during the winter months when the weather becomes too cold for them to survive in their northern habitats. Once spring arrives, the birds return to their homes. Equally as varied as the reasons for migrating are the ways in which different migratory birds make their journey. Some birds migrate alone, others travel in pairs and many move in large flocks. Some birds often migrate in swarms, while larger birds, such as geese,migrate in formation.

Many times this migration takes the form of the letter V.
Why?
The reason birds prefer to fly in a V shape has puzzled researchers for many years. There are two general theories to explain the V-shaped phenomenon. The most accepted theory is that the formation of a flock influences aerodynamics, making it easier for the birds to fly. As the birds flap their wings, the air flowing off their wing tips gives birds in the back of the V an extra lift.

This reduces the amount of energy the birds need to fly. Over the course of the migration, birds take turns leading the front of the V, the most difficult...

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http://sciencezone12..in/2015/04/ever-wonder-why-birds-fly-in-v-formation.html

Lordave:
Really educating, OP
Please do tell us why witches fly in 'J' formation. So many times I've wondered if na the straw wey dem take dey suck blood all of them dey help carry or dem they dodge thunder for 4 each person back

Lol! Reckon I don't av any idea of how witches fly. Av u seen one fly as such