last night i found a rat who was 8 weeks old dead, her face was eaten off and the left arm. she was in a tub with 4 other rats. 2 8-week old rats and 2 amonth old rats. i checked and there was plenty of food and water. what could have caused this? freak accident or is it normal? i will no longer raise the 4 rats and just feed them off.

this morning i found another dead rat. different tub. 4 months old. she wasn't mangled or anything. i feed them the same foods that i was feeding them since jan. what could've cause this?

thank you.