Smaug vs Ancalagon by Valonia-Feline on DeviantArt

Glaurung - Tolkien Gateway

Glaurung, Ancalagon, & the Dragons of The Silmarillion

Lord of the Rings' Father of Dragons, Glaurung, Explained

Dragon Size Chart! Whims from Valadae

The only thing bigger than Ancalagon the black : r/Silmarillionmemes

Lord of the Rings

NO SPOILERS] Westeros's Drogon(short necked, younger and faithful) vs Middle Earth's Smaug(Long necked, badass, intelligent, without a master). Who would win? Personally, I prefer short necked dragons but Smaug might can easily

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Smaug, The One Wiki to Rule Them All

Stream Dragons of the Lord of the Rings Universe - Smaug, Glaurung, Ancalagon, Scatha Lore (Spoilers) by ThePhilosophersGames