Levitosaur
A medium-sized lizard that hovered over the land, flapping through the sky in an awkward yet majestic manner. They were easily recognizable by their massive, bloated stomachs that housed several pockets of hydrogen gas. These gas pockets combined with their long fin-like forelimbs and rudder-like tail allow them to “swim” through the air almost like a fish.
Levitosaurs also possessed long snouts complete with a set of rounded teeth, which they used to snap up long grasses, their primary form of sustenance.
Levitosaurs gave birth to eggs, but their eggs contained the same hydrogen gas pockets that were found in adults, allowing them to float off the ground similar to their progenitors. This protected the eggs from small, terrestrial opportunists. The levitosaur embryo developed around the gas pocket, which eventually becomes a part of the young lizard. Newborn hatchlings could immediately take to the air.