Peaceful mobs such as cows, pigs, etc... they don't respawn after killed. After you kill them all your world has no animals. It didn't happen just once, it happens every time with every survival world.
Peaceful mobs such as cows, pigs, etc... they don't respawn after killed. After you kill them all your world has no animals. It didn't happen just once, it happens every time with every survival world.
Try killing every single mob, and see if any will respawn. There could be some mobs taking up the peaceful mob cap, preventing any from spawning. Do not quote me on this, since I only know this is true for the PC version, and I haven't really played the one in the App store.