Ecology.  Bird navigation--computing orthodromes.
Department of Zoology, University of Zürich, Zürich CH-8057, Switzerland. rwehner@zool.unizh.ch
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D000818:Animals; D001683:Biological Clocks / Q000502:physiology*; D001717:Birds / Q000502:physiology*; D003463:Cues; D004641:Emigration and Immigration; D005426:Flight, Animal; D009949:Orientation; D016082:Solar System; D014919:Wind