The Martian Birds are a species of animal native to the planet Mars. Their wingspans are over fifty feet long, with no apparent eyes or mouth, only a cylindrical 'head' with jagged mouthparts, and a short tail at the back. Four spherical chambers in their wings; two in each wing, possibly for use in Mar's light graivty for flight capability. They stay in groups; two parents and offspring.
The Martian birds are presumebly carnivores as they feed on other 'birds' and excrete waste of gases for micro-organisms in the upper layer of the atmosphere.
They're an original species created by the author for the Book One chapter: Family.