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Who is this Wyvern?
Smaug is a dragon and the main antagonist in J. R. R. Tolkien's 1937 novel The Hobbit, his treasure and the mountain he lives in being the goal of the quest. Powerful and fearsome, he invaded the Dwarf kingdom of Erebor 150 years prior to the events described in the novel. A group of thirteen dwarves mounted a quest to take the kingdom back, aided by the wizard Gandalf and the hobbit Bilbo Baggins. In The Hobbit, Thorin describes Smaug as "a most specially greedy, strong and wicked worm".
Critics have identified close parallels with what they presume are sources of Tolkien's inspiration, including the dragon in Beowulf, who is provoked by the stealing of a precious cup, and the speaking dragon Fafnir, who proposes a betrayal to Sigurd. A further source may be Henry Wadsworth Longfellow's 1855 poem The Song of Hiawatha, where Megissogwon, the spirit of wealth, is protected by an armoured shirt, but whose one weak spot is revealed by a talking bird. Commentators have noted Smaug's devious, vain, and proud character, and his aggressively polite way of speaking, like the British upper class.
Smaug appears in the second film, The Hobbit: The Desolation of Smaug. In an interview with Joe Letteri, Smaug's design was changed to the wyvern-like form shown in the film after the crew saw how Benedict Cumberbatch performed Smaug while moving around on all four limbs.