Bellyoon

The bellyoon replaced its ancestor, the kermit phlyer. With so much competition over the tropoworm it became a strict herbivore and eats only the floating flora such as the solar sailor and balurine. It doubled in size thanks to its new "belly balloons". Rather than having blisters of hydrogen all over its body it has developed specialized hydrogen sacs on its belly. It gets the hydrogen from the the food it eats. They also use photosynthesis to get extra energy. The sacs also can be emptied and act like an "air bladder" when they want to go down in altitude.

It has gained back its signature tail rudders that most phlyers have. This helps to stabilize it as it flies. Now that it partially floats, its able to have a longer gestation. Thus the baby when born is much larger and starts out with some hydrogen already in its belly bubbles. This means it can fly right from birth. When it gets tired they can rest on the back or even grasp on to the wooden spikes on the ends of the wings of their parents. Its limbs now have atrophied and are vestigial.