The Nerd of the Rings on X: Smaug and Glaurung were based on real dragons Tolkien encountered when he gained access to a secret civilization of dwarves who domesticated the creatures. Here
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The Life of Smaug & the Dragons of the North
Morgoth –
Smaug - Wikipedia
The Life of Smaug & the Dragons of the North
What if Glaurung attacked Lake Town instead of Smaug? - Quora
Who is more powerful, Glaurung or Smaug? - Quora
Did dragons in Tolkiens Middle Earth breed and produce young or was there a very finite number of them? - Quora
Where Did Smaug Come From? – Middle-earth & J.R.R. Tolkien Blog
Was Smaug the last Dragon in Middle Earth to live or are there perhaps more dragons out there yet unseen? - Quora
Glaurung, Dragons
The Life of Smaug & the Dragons of the North
Men (Not Dwarves) Killed All of Lord of the Rings' Dragons
What would have happened if Smaug had taken the ring from Bilbo and put it on? - Quora