I have 3 pet rats and one of my little girls is doing something and I can't for the life of me figure it out. When I talk to them she keeps picking up shavings in her mouth and then putting her mouth up to the bars on the side of the cage. Then she takes her paws and shoves all the shavings from her mouth and out onto the floor. She keeps doing this and I don't know if she is trying to play or maybe she is offering me something??