So, I just moved Remy (who's about 3-4 months old) into a bigger cage because the previous occupant, Nico, passed away. Before when I let Remy out for free range I would take the smaller cag and put it on the floor because it's small enough for me to do so. Remy is a pretty timid rat and it would take him a while to dare to come out. Now that he's in the big cage I can't put it onto the floor, so I can't get him out of his cage to come out and play. With Nico I would just open the cage door and he would climb out onto me, but Remy's to nervous to do that. It's not like he's terrified of humans, once he's on the floor he will climb all over you, and beg for food, but he has a problem coming out of his cage. He doesn't want to climb onto someone to get out. I'm worried he won't get enough exercise. How can I convince him to get on my shoulder?