I have so enjoyed having my 2 harvest mice Tom Thumb and Tiny Tim. The trouble is that Tom chases Tim and he makes him sqeak so badly at times. I mentioned this to my daughter this morning and she said 'please can I have Tom' She ordered a vivarium immediately and we managed to put Tom in a smaller tank that we had. Lo! and behold! when she picked little Tom up she noticed he had nipples and she is now the proud owner of a little girl Thumbelina! We are hoping she isn't going to produce some little ones!