why don't birds get electrocuted when they perch on a power line?

Birds don’t get electrocuted when they perch on a power line because they are not completing an electrical circuit. Electricity flows through a conductor, and since the bird is only touching one wire, the electrical current doesn't pass through its body. Additionally, power lines are insulated, which further reduces the risk of electrocution. However, if a bird were to touch two wires or a wire and a grounded object simultaneously, it could complete the circuit and get electrocuted.