Linguistics

As it turns out, the Gurindji people have a heightened sense of orientation, able to even detect the Earth’s magnetic field and use it as birds do.

I've found a bit more info about it in this page, for anyone interested. Apparently humans do have some poorly used geomagnetic sensory system, and due to their language's directional system the Gurindji speakers are actually training this system.

Another piece of evidence might come from colour mapping: I predict that speakers are more likely to confuse two hues if they're labelled by the same primary colour word in their language, even if their visual accuracy is similar.