In The Lord of the Rings, Middle-earth is no stranger to enormous creatures. From the Balrog of Moria to Shelob in Mordor, Tokien's world is filled with oversized monstrosities that terrorize those unfortunate enough to cross their paths. One such creature was the dragon Smaug, who claimed Erebor and all of its gold from the Dwarves with relative ease. Despite Smaug's gargantuan size, the dragon was nowhere near the largest creature ever to roam Middle-earth, as another member of his species takes that trophy by a landslide.
Source：https://www.cbr.com/lord-of-rings-biggest-creature-ancalagon-not-smaug/
