Versus Battle - Acnologia the Black Dragon v. Ancalagon the Black

Glaurung, The One Wiki to Rule Them All

What is the most accurate size estimation for Glaurung the dragon? - Quora

DRAGONS OF MIDDLE-EARTH SIZE CHART ANCALAGON THE BLACK, GLAURUNG THE FIREDRAKE OF GONDOLIN eaTUA THE - iFunny Brazil

The Depicted Size of Dragons - or Hyperbole Much? : r/tolkienfans

Tolkien Time: The size of Glaurung

How big do you think Darkstalker to be?

Who would win in a fight, Ancalagon the Black or Shruikan (Inheritance Cycle)? - Quora

Comparison of the Dragons of Middle-Earth

Glaurung the Dragon by sboterod on deviantART

Nasmith - Glaurung, in Alex K.'s Hobbit & Lord of the Rings Comic Art Gallery Room