Total Members Voted: 437
Mobs don't de-spawn.And jeb said that mobs don't respawn. (except enemies)It's just very rare for they respawn.
If you move 128 they either despawn or go dormant until found back.
They're random. They're island biomes, you'll have to go out in the ocean.
Most of time it's islands, but it's VERY VERY VERY rare
You'll probably never find one on Survival. It took me a while on Creative flying over the ocean after coming out of a Nether portal after traveling far there. Just randomly happened while I was looking for land for villages during my first test.
Look for grey grass. :P That's Mycelium.
I loving love the grey grassthat's why I want to live there so badWait, can you grow crops on it?
I hope blaze rods are used as glow sticks.