Board Thread:Speculation House/@comment-69.236.73.165-20130927001234/@comment-4802159-20131025150417

I would say all four.

Faunus likely have more physical advantages than simply strong night-vision. The extra sets of ears, when present, would likely provide very acute hearing as well.

Most people when they hear a noise have to turn their heads to figure out the direction its coming from. It's likely Velvet wouldn't even need to do that to know exactly which direction a sound came from, and possibly even how far away if it was relatively close. Ears are a basic triangulation organ.