The gasprinter has mutated in odd ways. Its crest has gotten brighter and sleeker helping it in mating purposes. Its beak has gotten duller. It has also lost any other coloring it had, including the stripes its ancestor had and with the lower body becoming more of a dark grayish brown.
The wing has gotten a small thorn on top of it which is connected to the muscles. This can hardly move. It has also gained the ability to sneeze while jumping. After which it extends it wings it is able to glide over lava pools.
It has evolved a sneeze-sac in its butt-nostril. This stores a little bit of air, every time it breathes in. It has a one way valve that stores up the air over time. Thus it will only release when it is fully pumped up. This make the gasprinters huff and puff when it breathes.
After the small sneeze-sack is pumped up with air it can use it to boost it flight. This behavior is called "sneezegliding". When pumped it also makes the gasprinters more impressing. This same organ can sense toxic gases.
Another small adaptation was making its tail longer. This simply aids them in making fast turns or direct stops, without falling. It has replaced its ancestor in Blood Lava Tube Cave.