We got a new baby rat in hopes that when she gets a little bigger, we can introduce her to the one we have so that she can have a buddy. For now we’re just putting their cages together. Here’s a video of the older rat making a noise when she sees the younger. I figure it’s probably hissing but also read where they can also make a quick breath sound which means their happy. Could you take a look at this video and tell me if it sounds like hissing? Thanks!