Thanks for the translation!
It's strange to think of beastmen as a result of natural evolution when they can breed with humans. It either means they evolved from some of the same ancestral species as us and are part of the Homo genus (or even the Homo sapiens species, making it even weirder), or that it's just a very, very lucky coincidence that we are genetically similar enough to be able to breed.
I might be, and probably am, speaking bullshit, since my knowledge of interbreeding is basic level, but it's a fantasy topic I often think about. Personally I'm more comfortable with them being magically created chimeras.