Pigeon Orientation by Dual Monopole magnetic field boundary layer...

Pigeon Orientation by Magnetic Dual Monopole Vector Information Field with Characteristic Curvature for Each Earth Location.
see: https://bigbang-entanglement.blogspot.com/2016/11/pigeon-orientation-by-magnetic-dual.html

See also dipolar near field theories and topological Nature of near fields.
Earth Magnetic monopole field with boundary layer profile, (B) which seems to be different for each place on earth and a navigation map for animals like pigeons, butterlies and turtles.
Animals like Pigeons and sea Turtles seem to be able to identify these specific curves (B) for different locations by the small amount of permalloy alike metals already found in their bodies, to explain the extraordinary qualities of animal orientation.
see also:
: https://www.flickr.com/photos/93308747@N05/albums/72157633287892650

see also: http://migratingblackholes.blogspot.com/2013/04/blog-post.html