Jaby said..
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If amphibian beings from the Sirius Star System have been here before, then it's not beyond the realms of possibility that they will come again. And if they do then it makes sense that they would need to arrive in water. So a stargate in the sea would be perfect?
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The definition of amphibian...
Cold-blooded animals that
metamorphose from a juvenile water-breathing form, to an adult air-breathing form.
http://en.wikipedia.org/wiki/Amphibian
Also this comes to mind....
Amphibian eyes
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Most amphibians, such as frogs and salamanders, have color vision, even though they may be restricted to narrower bands of the visible color spectrum than are humans. There are at least four types of photoreceptors or optical sensors with different chemical composition that allow seeing different amounts of color by amphibians. Since amphibians have been around a long time and have adapted to a variety of environments, their eye configurations vary slightly for different environments.
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http://www.eyedesignbook.com/ch3/eyech3-e.html