In the Sil Dragons are first call the Fire Drakes of the North so it may be there was always large lizards and Melkor had only to give Glaurung some of his spirt like he did to Carcharoth the Werewolf to have in the end after Glaurung grew what we see as Dragons later in the story.Meklor by the War of Wrath was weakend by putting so much of himself into his fellbeasts that all he could do is hide and run as the Valar entered Angband.Would have to think much of this went to the Dragons as they where by far his most mighty work.Ancalagon the black fought a full day and night against the host of the Valar so its safe to say this was one very very bad *** Dragon and would of riped Middle Earth a new *** had Earendil and the Valar not struck Thangorodrim when they did.
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He who arises in Might.
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