So, my one mouse had a litter about 1-2 weeks ago. They ate every single one(At least 8 of them.) My other mouse, in the same cage had her litter(Again, at least 8.) And they cannibalized every one too!! There are now four mice in the tub, but it's very large and there is plenty of room. I'm feeding them Doggy Bag food, and for the first litter, them were on pine shaving bedding, now they're on wood pellets.

It was ones first litter, and the others second. The first litter the one had, I gave to my rats to foster, and her daughter is now in the tub with her, but wasn't when they had the litter about a week ago. At that time, the male was still in with her, so I assumed he ate them, and took him out.

My other mice, in the other tub had hers two days ago. There were three mice in the tub, but one escaped a few days ago. She is on the same food, and pellet bedding. She had twelve, and ate the first one. I was there when she had them, and was cleaning cages, and even spot cleaned hers, and switched her from shaving to pellet bedding. This was her first litter, so she didn't have enough milk. every time I went out there, more were dead, and they had no milk bands. I took the remaining five, and gave them to my ASFs, and took a couple of the ASF babies and gave them to the mouse(Because she kept looking for her babies, and I felt bad, and because one of the babies broke it's leg, and I wanted to check on it with out being attacked.) Two more died with the ASFs, but the others have large milkbands now.

Even out of all the dead babies, she didn't eat them, and still had them in with the live ones.

Oh, and the best part? 11 of those 12 babies were ALL MALE. Idk what the last was, since she ate it. but maybe it's a good thing there are only three left... Eleven males would stink this place up very quickly!!

Why did the mice cannibalize all their babies? And, how do I prevent it in the future?