car collection collector dust Dustbin dustcar garbage junk litter man rubbish transport trash truck vehicle waste Australian raven blue black carrion eaters corvids corvus coronoides garbage collectors loud mournful omnivorous predators raven scavengers shiny black bare bare branches branches crow lone perched perching tree Australian-raven beak 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