A bird sitting on a high tension electric wire does not get electrocuted because

It has high resistance
The body is earthed
It does not form a closed path for the flow of current
Its feet are good insulators
It does not form a closed path for the flow of current  Birds don’t get electrocuted on power lines because electricity does not move through their bodies when they sit on them. When the bird sits with both its feet on the electrical wire, their legs have an equal electrical potential so the electricity will not move throughout the bird’s body.

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