OK i know that turtles do no have ears and so basically they cant hear BUT i love to sing and play guitar and for some reason it is only when im doin these things next to the tank that both my turtles will prop their heads up as if they sense somthing. Sometimes when i'm playing the guitar near the tank my oldest turtle will swim over to wear i am and then prop his head up nice and still as if listening. Now at first i thougt it was a coincidence and that i was being silly, but it seems to happen all the time. They leave whatever they're doing and listen. I was wondering, since sound is basically caused by vibration maybe they can actually hear since theyre sensitive to vibration. Can someone please tell me if im crazy or not? :/
p.s i've even tried stayin perfectly still so that they dont sense me and most time theyre not even payin attention to me..

