[mewpmewp2]

I mean that they would lose ability to tell where is north. Because theoretically, but probably not in practice they could have some sort of magnetic sense like birds are thought to have so it would translate beyond hemispheres. But unlikely since they never needed cross hemisphere ability. Also haven't heard of people developing a magnetic sense so far.

But I do think some mammals may have magnetic sense so maybe...

I specifically meant fail as in ability to determine north, not survival, put down or any sort of other negative reason to be clear.

[defrost]

> I mean that they would lose ability to tell where is north.

You're aware, I trust, that the sun rises in the east and sets in the west, regardless of hemisphere?

FWiW this isn't a theorectical "what if" .. right from the get go Europeans were taking southern hemisphere indigenous people to the northern hemisphere:

https://australian.museum/about/history/exhibitions/trailbla...

https://www.nma.gov.au/defining-moments/resources/aboriginal...