Nothing happens when birds land on a power line, yet we are warned not to touch a power line with a ladder. What is the difference?
(a) Birds have extremely high internal resistance compared to humans.
(b) There is little to no voltage drop between a bird's two feet, but there is a significant voltage drop between the top of a ladder touching a power line and the bottom of the ladder on the ground.
(c) Dangerous current comes from the ground only.
(d) Most birds don't understand the situation?