Dragons in Middle-earth - Wikipedia

Glaurung, Ancalagon, & the Dragons of The Silmarillion

Dragon Size Chart! Whims from Valadae

Lord of the Rings

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Glaurung studies by TurnerMohan on DeviantArt

Smaug, the Dragon in the Hobbit

Dragons in Lord of the Rings' Lore - Smaug, Glaurung, Ancalagon, Scatha - Tolkien and LotR Lore

Glaurung Father of Dragons by TheWatcherofWorlds on DeviantArt

Ancalagon - Tolkien Gateway

Balerion VS Smaug - Who Would Win