Glaurung Size Chart by SyndarilArt on DeviantArt

Glaurung, The One Wiki to Rule Them All

Your Quick Guide To Dragons in Middle-earth (and how to tackle one) – A Tolkienist's Perspective

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

Dragons of Middle Earth vs Elder Dragons & Souls Dragons

Glaurung by YellowPanda2001 on DeviantArt

Comparison of the Dragons of Middle-Earth

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

What is the size difference between Ancalagon the Black and Smaug? - Quora

Here there be Dragons added a new - Here there be Dragons

Men (Not Dwarves) Killed All of Lord of the Rings' Dragons