This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Bird keep there legs on a single is adaptive that only one flow of current will not harm them.if they keep their legs on two wires they get shock
Birds doesn't get shock when they keep their feet on one wire.
They will get shock on keeping their feet on 2 wires, because there is a tendancy to flow current through them since there is a P.D