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Additionally, a nonstandard lead was observed across the left forelimb and right hindlimb.
They have no eyelids, and all species have four fingers on each forelimb , five toes on each hind limb, and caudal fins.
An obvious modification was the elongation of feathers or ‘proto-feathers,’ which extended and broadened the forelimb into a wing that was much more sensitive to air flow.
For the sake of simplicity we will not address the bones of the wrist and paw in our study of the forelimb and girdle.
The several theories for the origin of avian feathers, as well as for the origin of the winged forelimb and avian flight, are all historical-narrative explanations.
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