My cat had 4 kittens in my laundry room about a week ago. Well, today when I got home I went to check on the cat & kittens, and saw that there were only 3 kittens in the usual spot. After I had looked around a bit, I saw that my cat had moved one of the kittens into a box on the other side of the laundry room, away from the others. Every time that I get near the box, Rosie (the mother cat) runs over there and curls up around it as if to hide it. I was thinking that maybe it was because I had picked up one of the kittens yesterday, but that wasn't even the kitten that I held. The kitten isn't the runt, and isn't any different than the other ones, so I can't figure out why Rosie would separate it from the others. Why is she doing this?