bird birds BLACK VULTURE carrion Cathartes aura everglades foriday scavenger swamp Turkey turkey vulture vulture wetlands wing wings Australian raven blue black carrion eaters corvids corvus coronoides garbage collectors loud mournful omnivorous predators raven scavengers shiny black avian beak feather feathers nature black and white crow Crows feathered fishmonk flight fly hunt hunting live living lone one only prey Rook rooks sole talon talons bare bare branches branches perched perching tree Australian-raven bearded bill black blue-black carrion-eaters corvus-coronoides foraging garbage-collectors grass ravens sharp-eyed shiny-black strong bare wires danger electrical electrical power electrical wires electricity power power lines power pole wiring