About 8 percent of power outages, or 9,200 a year, are caused by animals and birds, says Richard Beltran, a Florida Power and Light spokesman. In South Florida, iguanas are the second leading cause of power outages, behind squirrels. But that’s well behind power failures caused by vegetation, Beltran points out. FPL uses raptor guards and bird diverters to cover 75,000 miles of power lines, switches and conductors at 600 substations, he says. If an animal touches two of the three power lines attached to a pole, that's when current zaps them, Beltran says.