Why don't birds get electrocuted sitting on power lines?

The electric current is created by the movement of electrons. Just like water flows down from a high place, electric current flows from a point with high electrical potential to a point with low electrical potential. Consequently, electric current flows through the bodies of birds is possible only if the birds touch two points at the same time with potential differences between them. There is no potential difference between the points where the birds placed on a single wire touch. Therefore, an electric current does not pass through their bodies and they will not be damaged by this situation. However, if a bird touches two different electrical wires with potential differences between them at the same time, electricity starts to flow from one wire to another and the bird is hit due to the electric current passing over it. The reason for installing electrical wires with a distance between them is to prevent such distortions. Similarly, if a bird touches both the electric wire and the soil at the same time, the bird is again multiplied by exposure to electric current, as there is a potential difference between the wire and the ground.