Smaug vs Ancalagon by Valonia-Feline on DeviantArt

Dragon Size Chart! Whims from Valadae

504519 - safe, edit, edited screencap, screencap, basil, reginald, spike, dragon, dragon quest, dragonshy, g4, owl's well that ends well, secret of my excess, ancalagon the black, black dragon, comparison, firedrakes of

The 9 Dragons of Middle Earth

The Rings Of Power Could Make Smaug & Shelob Look Pathetic

Ancalagon the Black makes Smaug look like a little baby which just emerged from egg. - 9GAG

Certainly my dragon is bigger - 9GAG

Acnologia vs Ancalagon and Glaurung - Battles - Comic Vine

Bahamut (Titanodrakon Rex) by DraconisKiller on DeviantArt

Juan de Santiago - Senior Asset and Creature Artist - All

Smaug vs Drogon - Fight to the death