Animals hearing is so much more acute then ours. No one knows what they heard. Could have been an ant or small bug.
My Benny is a sweet loving bun who lets me hold him and kiss him. Snowy is afraid still, she might always be. However that does not mean she deserves or recieves less love, treats, concern, or kind words then Benny. Pets are here to love and cherise, yes they bring us happiness, comfort, love and laughter but if a pet is not so loving or afraid as Snowy is she needs even more love and understanding. No two pets are alike. And even though I miss my other buns, cats and dogs I don't expect the ones I have now to take their place. Each and every pet gives the amount of love they are capable of, that should be enough for us all. I know you love and take excellent care of your sweet little bunny. She loves you as much as her little heart is capable. It might not be the way you want but please except it for the precious gift it is.