accessory black cap clip emu feathers fashion feather feather in your cap feathers golden hat silky silver clip Australia beak bipedal bird dromaius novaehollandiae Emu flightless habitat leg native nature plumage walk Australian big big bird cultural culture curious curly double-feathers fast fauna icon iconic large long-legged long-legged flightless bird male nomadic omnivore omnivorous ratite runner sharp-eyed soft-feathered symbol symbolic three-toed widespread wildlife