Quote:
Originally Posted by gordner
Birds navigate by essentially a natural compass with absolutely no similarity to radar systems.
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Is seeing magnetic north considered (one-way) 'radar'?
https://www.newscientist.com/article/dn13811-birds-can-see-the-earths-magnetic-field/
It has been debated for nearly four decades but no one has yet been able to prove it is chemically possible. Now good evidence suggests that birds can actually “see” the lines of the Earth’s magnetic field.