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If the magnetic field flipped 780k years ago [0] and animals do rely on it for survival (like migrations), wouldn't we see mass extinctions around those magneti
by everdev 8y ago
If the magnetic field flipped 780k years ago [0] and animals do rely on it for survival (like migrations), wouldn't we see mass extinctions around those magnetic flips? Or maybe magnetic field navigation is a weak signal out of many?
[0] https://www.livescience.com/18426-earth-magnetic-poles-flip.html https://www.livescience.com/18426-earth-magnetic-poles-flip....
- TeMPOraL 8y agoIf animals learn where to migrate from their parents/flock, then it would be reasonable to assume they learn the relation between where they should be going and what their magnetosense is telling them. The article implies that even during transition, the magnetic field is pretty much constant within a lifetime of any individual animal. Now a tangential question I have is: how the hell do animals know where they should migrate? Is this learned from observation, or do they have some innate idea of where they should go?
- notduncansmith 8y agoI recently learned that salmon find their way back to their birth stream partly by smell: https://www.scientificamerican.com/article/how-do-spawning-fish-navigate-back/ https://www.scientificamerican.com/article/how-do-spawning-f...