Gargylen Features

[Gemma]

So ive been wondering about what features gargylens have and dont have as i start to get my characters look together. Ive read they have horns, gray skin and wings (which doesnt grant them the ability to fly). But i was wondering if if they can have tails. Much like having small wings, but as a tail. Im just trying to figure out all that is and isnt allowed for the race. When it comes to features and such