Not really a bug but a minor inconvenience. I was looking at some critters while I was drawing, that's why I turned of all the sounds ingame. But one of the idle animation sounds for the ewelet was still there. The one where it stands on two legs. You can also hear a sound when it falls down on it's belly and starts sleeping.
Like I said, just a minor inconvenience, but I don't want it to scare the living daylight out of anyone else, thank you for all of your hard work!
Turn of all the sounds and stand near an ewelet.