In my singleplayer game (around the time of 1.7) i trapped some chickens in my basement for egg farming. it took me about an hour to trap 5. I then went mining and when i returned found to my shock/horror that they had indeed disappeared. (Magically. -.- )My question is: (1) do mobs disappear if you go away from them? (2) Is there a way to keep my cruel factory farm without having to babysit the damn things?/Will this be made possible in an update maybe?