Vanilla mob changes

Added in v1.0.1

Skeletons take a break

When no player is around, a skeleton sits on the ground and waits. If you come within 16 blocks, it stands up and grabs its bow again. When you walk away, it sits back down.

The creeper's belly

The creeper now has a window in its belly, and you can see the TNT inside. When it's about to explode, the TNT blinks faster and faster.

Giant (or tiny) mobs

An operator can spawn any entity at another size, from one sixteenth to sixteen times its normal size. Just add giant and the scale to the /summon command:

/summon minecraft:zombie ~ ~ ~ giant 8

The mob keeps its size after a server restart.