They're seen on the flags of Bhutan and Wales (7)

I believe the answer is:

dragons

(Other definitions for dragons that I've seen before include "Mythical fire-breathing monsters" , "Fire-breathing, reptile-like creature" , "Creatures of Teutonic mythology" , "Flying monsters - St George slew one (7)" , "Menacing women" .)

I've seen this clue in The New York Times.

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