I must apologize for my flippant answers. You asked a very good question, and it deserves a proper response. The insulation on the pads of their feet will help prevent a circuit from one foot to the other. The voltage drop on a one inch length of wire, is probably the most that would be applied between the feet. The line voltage, and current flow would determine the amount of this voltage. It does not appear to be a problem.
A bird making contact with two conductors, is entirely different, it will produce instant smoke, and bad odor. There have been some incidents, when birds have dumped substations by trying to fly between the high voltage bushings at transformers.
