Penny makes this soft noise when pressed against me. Put your lips together then flutter them and make a pop pop pop noise, see what happens! I tried with Neptune and he immediately ran over and made the noise right back pressing his face to mine. It seems to be a happy communication. I tried it when he was being wild too, and he immediately calms down seems very happy and comes over to make it back to me, it's a very soft noise, kind if like bubbles. So I want to see what happens when you make this noise to your quakers??? And what do you think it communicates??