aquatic bill bird black black-necked-stork carnivore color colored coloring colors colour coloured colouring colours contrast contrasting ephippiorhynchus-asiaticus feathers glossy Jabiru large-birds long-legged long-necked near-threatened plumage slender stork waders wading-bird water-bird wetlands Australia Australian beak bluish-black-iridescent head iridescence fauna long-flattened-beak platalea-flavipes reflections shiny spoon-shaped-bill spoonbill sunlight sunshine wetlands-bird wildlife yellow-billed-spoonbill