After they fought or encounter goblins, orcs, uruk-hais, trolls, easterlings, Balrog, Great Eye of Sauron, Nazguls and their flying wyrms, after Frodo survived a giant spear swinged by a cave troll and he got pierced by a Morgul blade by a Ringwraith, after they pass through Amon-Sul, Redhorn Pass, Mines of Moria, Khazad-dum, giant mountain region of Emyn Muil, stinky Dead Marshes and then a man-trap tunnel with a giant spider named Shelob who pierced Frodo with her paralyzing sting and after they fought through Minas Morgul, they simply walked into Mordor.
Duckling isn't trying to hide. They follow anything mobile when they are baby and they consider it their mother. It is just a cute duckling imitating that cat to learn how to survive.
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