Do humans have a magnetic sense like animals?

[johnbbahm]

This got me to thinking about google maps. I did not find any cows, but I think I found cow shadows.
http://maps.google.com/maps?hl=en&ll=29.557732,-95.151641&spn=0.000652,0.000862&t=h&z=20
The image seems fast enough to capture cars on the interstate.

As far as the original question, I read in Scientific American about Birds using the difference in the polarized sky, to tell direction. I tried it and in fact the north/south sky
looks very different than the east/west sky.

 

[ImaLooser]

.Here in Bali the natives have excellent sense of direction. It would be worth testing. I'd do it myself, but a rigorous experiment is too expensive. It takes a soundproof room and some sort of randomized mechanically rotating chair, I think. All directional clues other than mag must be removed.

Come to think of it, not even that would work if the clues come from natural sunlight. How could that experiment be done? I don't know.