[Rocky]

I have read that the earth’s magnetic field sometimes reverses, and that during the transition, the magnetic field greatly diminishes. I wonder what happens to such homing devices in salmon and in birds during such episodes?

[green pastures]

I have read that, too. I don’t think we’ve experienced a reversal in modern times, however. I believe that will really mess with electronics, communications, etc. Sort of a natural, mega-EMP.

But there’ve been a lot of fairly recent (within the last few years) major die offs of birds and fish and ... The first link is about birds that mistook a Walmart parking lot for water...

http://latimesblogs.latimes.com/nationnow/2011/12/thousands-of-birds-die-after-crash-landing-in-utah-parking-lot.html

http://www.geekosystem.com/dead-birds-louisiana/

http://abcnews.go.com/International/page?id=12565986

http://www.naturalnews.com/030985_mysterious_deaths_birds.html