I'm answering Lunna's Question!
Well a lush green planet, it sounds like it might have an eath-like atmosphere. So ... it could be something like a six legged dragon-like lizard with scales that change colors at a dizzying speed. Unlike a chameleon though, this one would have wings. An evolutionary adaptation to the planet's lighter atmosphere. So it would in fact be a dragon.. but an herbivore, because of the abundance of plant life.