That Dragon that Daemon approached in the cave is reported to be Vermithor.
Arrax was far smaller than Vhagar in the scene that we saw.
A comparison of the Dragon sizes and their various fates.
I would also like to add that the Dragons featured in GoT and HotD are technically Wyverns.
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Obligatory mention of how Smaug in the Hobbit movies went from a typical four-legged DnD dragon ( as of AUJ's theatrical release ) to a wyvern ( as of AUJ's extended edition and the rest of the trilogy ).
Wyverns seem to be en vogue when it comes to fantasy media nowadays. I remember when they made the changes to Smaug after the theatrical release of AUJ. By the time the movie hit home video and Desolation hit theaters; Smaug is now wyvern.
The difference between wyverns and dragons, besides where the wings are. Is that wyverns in fantasy lore don’t breath fire.
The only series keeping it real, was Narnia. With dragon Eustace in VOTDT.