[Cloverfield]

Since Oddworld itself covers some spiritual areas, it would only make sense that the creatures of Oddworld have souls.

Even looking at something as simple as the Mudokons who are resurrected in Munch's Oddysee. In order to resurrect them you need spooce. Well spooce is a spiritual currency. So the spooce would need to interact with something that is already there in order to bring the Mudokon back to life. Therefore it would make sense that it would bring the Mudokon back based on his soul. If his soul is there, he has the capacity to come back again.

I also think that the intelligent creatures (Mudokons, Glukkons, etc ... not sure about the wildlife creatures) go through multiple lives and their soul comes back as a new Mudokon based on their last lifetime (I'm still not sure if you would consider the above example as a lifetime, or it is simply giving a Mudokon another chance at this lifetime). In these lifetimes, the soul may be given to different situations and even species (i.e. a Glukkon in one lifetime, and a Mudokon in the next) depending on what lessons they need to learn.

We also know that Mudokon status is based on their spirituality, therefore a Mudokon who's soul has evolved less will only be able to become a lower status, while the Shamans are the ones who have lived many, many lifetimes in order to get to where they currently are. And because Sligs and Glukkons are very materialistic in nature (i.e. care about moolah), this is a sign of a lower evolved soul. Therefore with how these species are at current (not in the past), they would also have souls that are lower evolved.

Abe Babe...