How do birds sit on high-voltage power lines without getting electrocuted?

Question: How do birds sit on high-voltage power lines without getting electrocuted?
- Keywords:
  animal,
  electricity
Asked by till.bob to Tadhg on 16 Jun 2015.
- Tadhg O'Donovan answered on 16 Jun 2015:
  
  Seems strange doesn’t it! I’m not recommending it, but if you were to perch yourself on a live wire – you’d be fine too. The electricity needs to flow through the bird to be dangerous. So if the bird was touching the ground and the live wire (yes – a very big bird) then it would be toast! By touching the ground a loop would be created and the electricity would flow through the bird to the earth and it’d be bye bye birdie.

Question: How do birds sit on high-voltage power lines without getting electrocuted?