Because they only contact one live wire and do not contact the ground wire, there is no current in their bodies. Therefore, the bird did not hook the live line and the zero line at the same time, so it could not form a loop. At the same time, the current flow distance is too short (bird body), so the voltage drop is very small, so there is also current flowing through the bird body, but the current is too small, which is generally not enough to threaten life. Why can't a bird get an electric shock when standing on a high-voltage line? However, if the bird's body is standing on a wire and the bird grinds its mouth on an uninsulated pole or frame, an electric current will flow through the bird, causing it to get an electric shock and die.
Insulating porcelain bottles are always separated between the iron frame fixing the wires on the high-voltage transmission line pole and the wires, which can not only protect birds from electric shock, but also avoid power failure caused by bird electric shock.
Therefore, the reason why a bird does not get an electric shock when it falls on a wire is the same as that an electrician does not get an electric shock when he contacts two end wires at the same time. （XiaoDiaoZhanZaiGaoYaXianShangWeiShenMeBuHuiChuDian）