Boas described these creatures in great detail, "All...

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Boas described these creatures in great detail, "All...of them wore a very tight-fitting siren-suit, made of soft, thick, unevenly striped gray material. This garment reached right up to their necks where it was joined to a kind of helmet made of a grey material that looked stiffer and was strengthened back at nose level. Their helmets hide everything except their eyes, which were protected by two round glasses, like the lenses in ordinary glasses. Through them, the men looked at me, and their eyes seemed to be much smaller than ours, though I believe that may have been the effect of the lenses. All of them had light-colored eyes that looked blue to me, but this I cannot vouch for. Above their eyes, those helmets looked so tall that they corresponded to what the double of the size of a normal head should be. Probably there was something else hidden under those helmets, placed on top of their heads, but nothing could be seen from the outside.

http://www.conspiracyarchive.com/UFOs/boas-abduction.htm