One had its leg bitten off while I was sleeping. It bled out and died in the morning.
Three died from fighting each other to the death a few weeks later.
Two got extremely sick and died.
Two died from unknown causes...I found their carcasses half eaten the next day.
The remaining three survivors passed away with age (they have a lifespan of 2-3 years)
One thing I noticed: all of them except for the survivors died when I was asleep...
