On: Why are submarines demagnetized?

[dnautics]

I think your understanding of evolution is a bit off, since there are other creatures with common ancestor (birds) that can see into long UV.

[madaxe_again → dnautics]

And magnetic anomalies, apparently, if they're migratory, via polarisation of uv iirc.

[dnautics → madaxe_again]

another hypothesis is that spin-coupled electrons preferentially and directionally emit photons from a cryptochrome protein. But tbh, we don't really know yet.

http://www.ks.uiuc.edu/Research/cryptochrome/