Just got home and one of my mice (who seemed fine this morning) seems to be on deaths door. I don't think she will last another hour. I've had her for 9 months and I am not sure how old she was when I got her... but mice lifespans are very short. :C I gave her a ton of pets and cuddles, and she is cuddled up in her little nest corner for her end of life. :C She was my favourite of the two mice.