While each species posesses its own sub cultures and subtypes, they are all pretty much undiverse within themselves. Each species generally prefers one lifestyle - while there may be rogues who go out and do other things, glukkons, muds, whatevers, they usually all do the same sorts of things. In the same way creatures in the wild usually only do things unique or related to their species.
We as humans however, are very diverse. We all do lots of different things. It's much more popular to be unique on a world with only one intelligent species, than it is on a world with many different species. If you are a gluk, and want the lifestyle of a mud, then that's something different altogether. Whereas if you are a human, you can pretty much live how you want without having to change much about your identity. You've only got your own kind to impress, because your own kind are the only ones.
At least, I think that is what PA is trying to get at.
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