This pig suffers from two different malformations that occurred during fetal development. The first being Diprosopus or craniofacial duplication. This is pretty self explanatory, this pig simply began to develop two faces. In this case two snouts, two mouths and near the top of the skull most likely a third (partially developed) eye.
The second malformation seen here is known as anacephaly. This means that this specimen has an underdeveloped brain and an incomplete skull caused by a neural tube defect. This neural tube normally closes and begins to form the brain and skull, but in these cases the tube does not completely close. So only part of the brain is developed and the rest is not covered by bone or skin.
This is a rare specimen, I always offer these as is, completely wet preserved and shipped vacuum-sealed. It can be placed in any jar and simply filled with rubbing alcohol to display indefinitely.