hey ... obviously new to the group ... we bought a pretty 9-month old stp yesterday and she seems very handleable and even-tempered. of course, once we got her cage set up, we put her in there and are leaving her alone for a long while to get adjusted. my only concern is that she keeps making this noise that may be a hiss very sporatically. she did it a bit as she was looking around her new home and then just every hour or two now. it sounds like a bike tire deflating or a balloon losing air and is very short. she's not open-mouth breathing, no gurgles or panting. is she just reacting to being a bit stressed?