First, let us examine the physical characteristics. The skin of a Grey is very similar to that of dolphins in texture, and in most cases, coloration. On Terra, cetaceans evolved legs and arms to function on land, but when they returned to the oceans, the arms and legs evolved into flippers and tails. X-ray analysis clearly show the residual appendages in modern day dolphins and whales as being comparable in skeletal structure to that of land-dwelling mammals in placement and types of bones. It is possible that the Greys evolved much like Terran dolphins did, but did not return to the oceans, but continued to develop as a land based mammal.
Next is the skull shape: The Greys have a large rounded skull region area on the upper anterior and posterior sections of their skulls. An examination of the dolphin skull shows very similar large, rounded anterior and posterior areas. The eyes of Greys are described as large and black, with what appears to be a protective shielding covering the eye. Many Terran aquatic animals have developed protective outer eye shields for underwater use. It is possible that this is a left-over attribute from the Greys’ ocean origins which has not been bred out, perhaps due to several unknown advantages of the shield.
Another factor is the dark coloration of this eye shield. It suggests an eye structure suited for a reduced light environment. In the oceans, this would be natural for a creature living underwater were the planet’s primary’s light does not penetrate very deep. The dark coloration would in indicative of eyes that absorb nearly all the light that enters it, creating the appearance of blackness. On Terra, dolphins and other cetaceans developed sonar ability as their primary navigational aid, and thus do not rely as much on sight while underwater.
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