Answer: Surprisingly, although they appear to lack most of the structures of an ear, they don't lack all of them. They have enough of an 'ear' to actually hear--even airborne sounds.
http://www.anapsid.org/snakehearing.html
http://www.anapsid.org/torrey.html
http://www.highlightskids.com/Scienc...snakesHear.asp
http://www.andhranews.net/Technology...hear-35946.asp
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