Some of the “tetrapod vertebrate” wildlife on the avian homeplanet in Runaway to the Stars. All of them have six or less fairly simple eyes with a retina, lens, and sphincter eyelid; four legs with four digits or less; and an axial skeleton ending in a pelvis. Like a frog, they have no tail vertebrae– any “tail” you find on avian wildlife (and on avians) is a muscular structure connected to a knob at the end of the pelvis. Avians are part an extremely small and recent group in the feathered clade, who are the first “tetrapods” on their planet to evolve powered flight.

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