Sans: Forskelle mellem versioner

* [http://www.sciencedaily.com/releases/2004/05/040514030725.htm 2004-05-14, Sciencedaily: Following Earth's Magnetic Field: Chemical Reaction In Birds Provides Sense Of Direction During Migratory Flights] Citat: "...Migratory birds have long been known to possess a magnetic compass that helps them find the correct direction during their migratory flights...Now, our study points to what we need to look for a molecular substrate for certain chemical reactions. That is, we can rule out magnetic materials in birds’ beaks and elsewhere..."

** [http://news.bbc.co.uk/1/hi/sci/tech/4038179.stm 24 November, 2004, BBC News: Pigeons 'sense magnetic field'] Citat: "...The pigeons probably use tiny magnetic particles in their beaks to sense our planet's magnetic field, scientists say..."

 

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