Warg because Bilbo did not "find" those. He "found" spiders in Mirkwood, he "found" Goblins in the Misty Mountains, and he "found" the Dragon Smaug. The Wargs came upon him rather than him coming upon them.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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