The whole "don't keep as a pet" issue is indeed a lot easier when you raise the entire tank full o mice yourself. Even better when you go with all albinos because then...they just look the same... and when you end up with 25 mice in a 20 gallon tank feeding time isn't so hard . I havent made the transition to rats yet (mine gets three mice at a feeding) because of the cuteness factor. Although I will admit to having a breeding pair of colored mice first and they were my pets...but the babies were feeders.