Board Thread:Speculation House/@comment-24218038-20131202202153/@comment-24218038-20131204011034

Maki Kuronami wrote: Regarding Blake's bow... It's not really obvious to humans.

But Faunus seems to easily tell that it's just a way to hide her ears, given that Sun saw through it while passing by her.

It's a perfect disguise; She can blend in human territory, and gather information. That's most likely her common job when White Fang went violent. I think it still is :)