considering many non-humans seem perfectly capable of making moral judgements, and feeling happiness or misery (all actions which appear to be explicable by purely material means), a 'soul' seems unnecessary to explain such things in humans. and it seems the very height of anthropocentrism to say that humans are immortal (despite all evidence to the contrary) while everything else just dies. why would just humans have these souls instead of, say, dolphins, or wild boars, or rattlesnakes, or coastal redwoods?