Board Thread:Speculation House/@comment-14138255-20140815002519/@comment-24994749-20140818144440

Well, Blake does display other cat like attributes for those who bother to look closely: be it food preferences ("She does like tuna a lot."), athletic attributes (her landing strategy was not shown because she would have just landed on her feet; wouldn't be surprised if some of the things she did during her entry exam were what originally gave her away as a faunus to Ozpin, at one point she even runs vertically up a pillar while everyone else is using recoil to prompt themselves up) and the shape of her eyes.

Thinking about it, we have never seen her interact with another faunus, since her arrivel to Beacon, before Sun, who pretty much went after her. Perhaps because all those minor details a human could easily ignore would have been easily noticed by a faunus? It gives her watching Yang during the Initiation another undertone, aside from the fact that she was evaluating for a competent future team mate, she might have also being deliberately seeking for an human one.