Croatian ancient river naming conventions

[Nay_Sayer]

It's difficult to explain why murder is wrong without implying that eating meat is wrong. The most obvious answer is that, like Descartes claimed, non-human animals cannot feel pain. But modern science has made it clear that for birds and mammals (aside from perhaps those with very devolved nervous systems such as naked mole rats) that's not the case. And I think we can all agree that even in Descartes'es time, there was no good reason to think that.

What does this have to do with Croation river naming?

ISN'T IT OBVIOUS?! OPEN YOUR EYES!