how my mice roll

[KORBIN5895]

So my second female that was in segregation gave birth and I need to count the pinkies stool and will update tonight.

I do have a problem though. I have had four hoppers die in the last five days. The first one I assumed was suffocated as it was in the bottom of the pinky pile. Then I found another the next day. I started wondering if the water bottle was too high so I lowered it. Well yesterday I found one missing its head and and front legs and today I found one missing half of his head. To make matters worse I also found two pinkies/ fuzzies with holes chewed into them. They were alive bit I put them down as I wasn't about to try and nurse them back to health. Now they have plenty of food and water so I don't think it's that. Any other ideas?