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how do birds know how to migrate? Did evolution pop it in their brain or were they designed?
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[quote:Anonymous Coward 14874606:MV8yMTU0MjYxXzM2NDM3NDczXzU2QURBNDA5] http://www.godlikeproductions.com/forum1/message1921176/pg1 [quote:Swinging on Spirals:MV8xOTIxMTc2Xzk3NDYxN0ZF] Although it has been strongly suggested that magnetism is the source for guidance in migratory animals, a new study seems to put the question to rest. The cells of certain migratory animals contain iron-rich crystals called Magnetite that are highly susceptible to earth's magnetic field. [b]Migration explained? Likely source of animals' magnetic sense identified[/b] [i]Researchers have isolated what are essentially tiny compass needles in the noses of rainbow trout that may explain these and many other animals' incredible ability to navigate across vast distances. [b]When cells scraped from the trout's nasal passages were placed in a rotating magnetic field, a clump of tiny iron-rich crystals inside the cells called magnetite — the same mineral used in compass needles — spun in synchrony with the field, turning the cells around with them.[/b] The strength of the crystals' magnetic response, and their firm attachment to the surrounding cell membranes, lent strong support for what scientists have long suspected: That [b]these crystals lean back and forth like a sail in response to Earth's weak magnetic field, and that the cells they are embedded in somehow convey their swaying movements to the brain.[/b] This is believed to confer trout and other migratory animals with a "magnetic sense" by which to judge direction.[/i] ...As detailed in a new paper published online July 9 in the journal Proceedings of the National Academy of Sciences,[b] the researchers found that the magnetic cells in the trout's noses swayed in response to a magnetic field [color=red]100 times more forcefully than had previously been predicted.[/color] [color=red]"More importantly, we show for the first time that the internal compass needle has a strong connection to the plasma membrane [or outer membrane] of the cell, which is important to realize an immediate sensing process,"[/color] [/b]said lead researcher Michael Winklhofer of the University of Munich in Germany. http://www.sciencenews.org/view/generic/id/342165/title/Trout_nose_cells_follow_magnetic_fields http://www.foxnews.com/scitech/2012/07/10/likely-source-animals-magnetic-sense-identified/?intcmp=features http://www.msnbc.msn.com/id/48124812/ns/technology_and_science-science/#.T_wjWpErd8U http://news.sky.com/story/958077/scientists-solve-trout-navigation-riddle [/quote] [/quote]
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