Glenn Møller-Holst wrote:
> Carlsen wrote:
>
>> Hej NG...
>>
>> Jeg sidder og strikker et forløb sammen til mine elever i fysik/kemi
>> (folkeskolen), og vil finde noget om bl.a. duer og delfiners evne til
>> at navigere over store afstande pga. ferromagnetisk stof i hjernen -
>> nogen som ligger inde med oplysninger/adresser?
>>
>> På forhånd tak
>> Lars Carlsen
>
>
> Hej Lars
>
> Ja, det er jeg stødt på. Kig på:
>
> 2004-05-14, Sciencedaily: Following Earth's Magnetic Field: Chemical
> Reaction In Birds Provides Sense Of Direction During Migratory Flights:
>
http://www.sciencedaily.com/releases/2004/05/040514030725.htm
> 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..."
>
> 24 November, 2004, BBC News: Pigeons 'sense magnetic field':
>
http://news.bbc.co.uk/1/hi/sci/tech/4038179.stm
> Citat: "...The pigeons probably use tiny magnetic particles in their
> beaks to sense our planet's magnetic field, scientists say..."
PS:
Jeg kan ikke gøre for at de 2 kilder er selvmodsigende - det kan dog
fortolkes sådan at duer har "kompas" i næbbet - og andre fugle ikke har
"kompas" der...
/Glenn