Travelling home now after a short break and it strikes me we have discussed the science and creationist aspects in some detail but there are philosophical aspects which Bill D can help us with. For those who care, what led me to it was wondering how Nagel's bat fit into
this. The question I suggest we reflect on is to what extent species exist in a formal sense and to what extent they are arbitrary human constructs.

Let me express it another way
Humans are fantastic pattern recognition devices but are prone to detecting patterns that don't really exist. To what extent are we doing this?