ok so i was at work the otherday and my little brother calls me to tell me that two of the mice are dead. when i get home i noticed that the dead mice were the males in the cage and their faces were torn apart. kinda looked like the creatures from tremors. well the next day at work my manager said that he use to breed mice and the females will do that when they are pregnant cause males eat the babies.
so my question here is "Is this true and if so, how can i prevent that in the future?"
also when a female is pregnant how long does it take for her to give birth?