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From: Phys.org yesterday:
Authors Richard Holland, Bangor U. And Dmitry Kishkinev, Keeler U.,
Article in "The Conversation"

(A simplication)

A group of scientists has released a study that confirms that birds migrate
using the earth's magnetic field. (There may well be other influences)

Put simply, Eurasion Reed warblers migrate thousands of miles. After one
successful migration, they can repeat the trip.

The "how" was the question. The proof came when they trapped some warblers,
then, when they were released, they noticed that the feet had scratched the
trap tubes. All the birds chose to leave the tubes in the direction of
their breeding grounds. (Wow)

They set up a chamber where they could manipulate the magnetic field.
Basically gave them a false "true north" which the birds then followed.

Birds appear to have a Cartesion map. (Like gps) North to South by magnetic
strength and east to west by declination.*(An example would be the angle
the sun's rays hit the earth 2/16)

So the data that you brave birdwatchers are recording may be used in future
understanding of migration. Those cool roost and feed observations during
northward migration may further our knowledge base.

[Other research is needed to determine what parts of the bird work this
magic.]

Great Work,

Catherine Paris
[log in to unmask]
Ozark County


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