With the recent proliferation of monsters in the warhammer world (I'm totally not complaining), I'm starting to wonder where'd they all come from. Over and over again GW keeps repeating that "it's a creature of chaos", but what does that mean? Are they only summoned into the realm? What aren't "creatures of chaos"? Does anyone else remember the old pictures of the griffon and dragon eggs. Do "creatures of chaos" have moms and dads?

If anybody knows, fill me in.