User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-5805144-20141018020029/@comment-5043481-20141019225116

My theory on this is that the skulls are mimics, grown by the crab to intimidate and impale threats. Backup for this

-As we know, those skulls are huge, and we don't see any wyverns that big.

-The bone structure is all wrong. The jaw is one solid lump of bone, and there are no little holes for nerves etc. There is also no nose, which are ussually very big features on a skull.

-The space inside a skull is very limited, not really enough to contain anything useful. Also, when we break the skull we se there is lots of space for diamyo. Shogun - not so much.