animal Australian bird curved bill eating ecology elegant fauna feathers feet grass hungry ibis legs nature ornithology sunny Threskiornis moluccus white white ibis wild wildlife appearance Australian-white-ibis bare-black-head color coloring colour colouring common competitive downcurved-bill fairly-large ibis-family odor odorous odour pest pesty strong-smell threskiornis-moluccus urban wader wading-bird water-bird white-plumage widespread companions pedestrians people public tourists drake duck farm farm-bird farmyard fowl open-farm poultry