AC ampere cable current distribution electric electrical high installation insulation insulator line lines pole post power volt voltage wire wires electricity insulate old sky supply tower transmission transmit wood wooden.pole cables dry heat power lines sand sand dunes stones towers usa Yuma blue sky Electricity tower metallic structure structure bushes hiking hill hillside outdoors plants rocks san diego angle angles bird crossing horizontal intersect parallel parrot sweep clouds cloudy danger gray grey hydro metal silver storm tall Australian raven bare bare wires blue black carrion eaters corvids corvus coronoides crow electrical power electrical wires garbage collectors lone loud mournful omnivorous perched perching power pole predators raven scavengers shiny black wiring