A Creature.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import crafttweaker.entity.IEntityCreature;

IEntityCreature extends IEntityLiving. That means all functions available to IEntityLiving objects also are available to IEntityCreature.

ZenGetter	Type
ZenGetter hasPath	Type bool
ZenGetter isWithinHomeDistance	Type bool
ZenGetter homePosition	Type IBlockPos
ZenGetter maximumHomeDistance	Type float
ZenGetter hasHome	Type bool

Method expects nothing.
Returns nothing.

ZenScript
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entCreObj.playLivingSound();

First method expects an IBlockPos object and an int.
Second method expects nothing.
Both methods return nothing.

ZenScript
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entAnObj.setHomePositionAndDistance(IBlockPos pos, int distance);
entAnObj.detachHome();

Method expects an IBlockPos object.
Returns a bool.

ZenScript
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entAnObj.isPositionWithinHomeDistance