Engels, 2014, in Nature.
European robins lost their magnetic compass inside a city.
The cause?
AM-band electromagnetic noise, 50 kHz to 5 MHz, ordinary urban hum.
Shield the lab in aluminum, the compass came back. remove it, gone again.
The first clean proof that man-made EM noise blinds a biological magnetic sense.
Published in the world's top journal. buried for a decade.
