How Come Pigeons Don't Get Electrocuted When They Sit On High-Voltage Wires?

Electricity flows by the movement of electrons along the path of least resistance .

The resistance in the metallic wire is negligible compared to the bird’s feet. Therefore, electrons bypass the bird and continue flowing along the wire.

However, if the bird happens to touch another wire, it will get electrocuted. The wires carry different voltages, and the bird will  inadvertently become the path of least resistance to let the electrons flow through. In other words, this completes the circuit. To avoid this, power lines are set up with plenty of space between the wires.

In comparison, human beings will be electrocuted even if they touch a single wire. They are made up of 90% water mixed with electrolytes which are extremely conducive for electrons to flow through.