Why do birds sit on high-ranking voltage wires within the dribble?

birds line up on wires it seems in the drip more than in summer

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They get a charge out of it.

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1. they travel in flocks
2. its not just wires... buildings,parks, trees. anyplace big satisfactory for all of them to land. i imagine the choose wires because its within the open, and they can see any possible threat fro the air, and keeps them absent from threats on the ground.
3. to get a charge from the lines, you have to touch 2 at the same time. 1 wont necessarily hurt you, which is why they can do this

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Because they flock together to migrate.

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Place to roost and also have to be some warmth there and look out for predators.

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Answers:    Because in the summer they are busy sitting on the eggs surrounded by their nest maybe.

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Maybe it keep their feet warm.

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They are congregating to prepare for their trip south for the winter months.

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because they can

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