Hello, about four days ago I bought a small rat from a pet store. He doesn't have any problems or bites yet, but he won't let himself be picked up so I can take it out. He's always trying to slip me out. When I want to pet him, he doesn't run away, as was the case with my previous pets. He looks rather scared and I don't know how to relieve his stress. By the way, he accepts food, he doesn't have a problem with that either. Do any of you have any experience, what tricks could take on him? I don't even know if it's a male or a female, because I can't even turn him around and look.