Animals can be so funny. These t bunnies are no exception. The other day after cleaning the gerbils' cage, I was letting them (Sugar & Spice) back in. They both tried to exit the one hole at the same time. It was like a Larry and Moe moment. When they decided that it wasn't working, they backed up - and they tried again! Eventaully they both squeezed out at the same time. Guess they have no concept of taking turns. Made for a good laugh.
Poor Nellie. I wouldn't throw away the litter box just yet though - cats do weird things and she could very well turn up some day out of the blue. Our cat was missing for over a week last summer and just strolled home one day. We have no idea where she had been all of that time.