Board Thread:Speculation House/@comment-14138255-20141031002615/@comment-24994749-20141215235757

There is this theory I once proposed on the Wars Thread.

Setting aside the part about the Grimm being weapons rather than a natural occurrence of Remnant or that faunus aren't really targeted by them.

Faunus and humans have to have some form of common genetic ancestry given that they can interbreed (though we don't really know if the offspring is fertile, which is another important subject to take into account from a biological stand point).

Assuming that an human-faunus hybrid would be fertile (correct me if I got my biology wrong) then it would be safe to assume they are at least both sub-species with a recent common ancestor.

The other theory I had proposed was that humans are the original species and faunus are its evolution (though this would imply that an human couple should be able to able to have faunus offspring). Or that faunus were created by humans, to better survive the Grimm given their heightened senses.