Or not. Went to move Pixel cat and the kittens to the bathroom to shampoo under the head of the bed... got the box set down in the bathroom, and before I could even stand back up, she had one of the kittens and was out of the box and under the bed. Once I took the box back into the bedroom, she was fine with me putting the kitten back in the box, and hopped right back in herself.
Spaz cat. So, I wiggled stuff around until I could get the shampooer in, with the bed right against the box and other stuff in the room, and Pixel glaring at me and half way panicky with the shampooer running near her babies... but she stayed in the box, so I guess it was a win win situation.
I've never seen a cat growl while it was carrying it's own kitten, but she gave me the clearest "go to hell" look ever as she stalked away with the kitten in her mouth, grumbling at me with every step.