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Migratory birds use head scans to detect the direction of the Earth’s magnetic field

In English

Författare

  • H. Mouritsen
  • G. Feenders
  • Miriam Liedvogel
  • W. Kropp

Summary, in English

Night-migratory songbirds are known to use a magnetic compass [[13]], but how do they detect the reference direction provided by the geomagnetic field, and where is the sensory organ located? The most prominent characteristic of geomagnetic sensory input, whether based on visual patterns [[47]] or magnetite-mediated forces [[8, 9]], is the predicted symmetry around the north-south or east-west magnetic axis. Here, we show that caged migratory garden warblers perform head-scanning behavior well suited to detect this magnetic symmetry plane. In the natural geomagnetic field, birds move toward their migratory direction after head scanning. In a zero-magnetic field [[10]], where no symmetry plane exists, the birds almost triple their head-scanning frequency, and the movement direction after a head scan becomes random. Thus, the magnetic sensory organ is located in the bird's head, and head scans are used to locate the reference direction provided by the geomagnetic field.

Publiceringsår

2004

Språk

Engelska

Sidor

1946-1949

Publikation/Tidskrift/Serie

Current Biology

Volym

14

Issue

21

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Biological Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1879-0445