animal arched beak behaviour bird curved drink drinking natural nature neck reflection river self reflection sip swan thirst thirsty water white agave agave-attenuata appearance background century-plant flower flowering foliage foxtail garden garden-plant gardens hardy large-flower lion's-tail mexican ornamental plant plants popular rare stem suburban succulent-like swan's- neck Australia Australian black black-swan curved-neck cygnus-atratus dark elegance elegant emblem emblematic fauna gregarious iconic large long-necked pair protected protected-species red-beaked red-eyed social symbol symbolic water-bird Western-Australian-State-emblem wildlife