User blog:Theory of everything/Wesen Evolution?

I've always assumed that all of the creatures we see featured on Grimm evolved as a seperate species, independent of humans. These creatures were forced, or by their own choice, to live among humans, developed, or naturally had, the ability to "disquise" themselves as humans to live undetected, that is until a Grimm happens by.

However, with the recent comment by a Steinadler that it had a relationship with Marie Kessler, this opens up the possibility that all these creatures may have human DNA within them and are, as a result, evolved as a result of human interaction.

This might explain why they retain their human appearance when they die. Crawford Grimm wrote that some of the creatures, when they died, reverted back to their human form. So, it may be as a result of their human genes setting itself up as a natural "camoflauge" defense against detection by normal humans.