http://www.anapsid.org/reptilehearing.html
"There is some evidence that some (or possibly all) true chameleons produce very low-wave sounds that may be used to communicate."
Thaxter *must* hear because he obeys me! - Of course, the primary command I give him is "Now, you be a lizard while I'm gone." But he's never once failed...
i would say that there hearing is nominal. my roommate has 500watt paradigm system. it shakes things off the wall, Morken doesn't seem to be bothered by the overall sound or even massive vibration. unless he is sleeping that seems to make him react. even then he just moves to a part of enclosure that is not near wall. then he goes back to sleep mode. on the other hand we have a door that squeeks real bad that he seems to hear whenever it opens. so i would have to say they can hear some frequencys.
being able to search requires above 50 IQ. I just don't qualify! but thank you for the patronization. im sure all us idiots thank you too. to claim intelligence proves a lack there of.