2 · Nature
25 · earth, world as celestial body
25F · animals
25F3 · birds
25F36 · water-birds
25F36(...) · water-birds (with NAME)
25F36(DUCK) · water-birds: duck
25F36(DUCK)(+4) · water-birds: duck (+ animal behaviour)
25F36(DUCK)(+49) ·
water-birds: duck (+ audible means of communication of animal(s): roaring, crying, singing, barking, mewing, neighing, chirping, etc.)