Birds can land on cables with no bother, because there is no way for the charge to go to ground through them.
Only if they touch only one cable. If the touch two cables (which is possible for a big bird like a swan) there exists a potential difference and hence current will flow. The lines are grouped in three for three phase electrics.
Only if they touch only one cable. If the touch two cables (which is possible for a big bird like a swan) there exists a potential difference and hence current will flow. The lines are grouped in three for three phase electrics.