Smaug - Tolkien Gateway

Glaurung, Kaijuwikia Wiki

Calculating the size of Glaurung : r/tolkienfans

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

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

Glaurung, VS Battles Wiki

Glaurung Father of Dragons by TheWatcherofWorlds on DeviantArt

Smaug, Wiki

Smaug, The One Wiki to Rule Them All

King Ghidorah with Smaug (with meme) by Filiko on DeviantArt

Isengard - Balrog vs Dragon: I have given that some thoughts. At the beginning I asumed that they would be quite equal, but I found a threat in a Tolkien forum where