Why is birds in electrical wires.

The body of living things transmits the electrical current. But to transmit the electric current, there is an electrical circuit, and the current should flow through this circuit (in other words, electrons are transported).

When birds are placed in electrical strokes, the electrical current does not pass through their bodies, as they will not form an electrical circuit, including the short circuit. People would wear an insulating shoe in a way that does not pass the electric current, and if there was no connection with the soil, electricity would not be shock when the outlet tried to insert the nail with naked hand, because the electric current could not find a transmission that would pass through the human body and flow into the soil.