Board Thread:Lore/@comment-26073467-20150522025508/@comment-26298013-20150621121327

A quick note on dragon classification: Dragons are classified based on their ability to breathe fire and fly, so you have "Cold" drakes that can fly, and cold drakes that can't, fire-breathers that can fly, and finally fire-breathers that can't fly.

Scatha, if I remember correctly, was a cold-drake who could not fly. Glaurung could breathe fire but could not fly.