Date: July 6, 2017
Source: Lund University
Summary: The genetic make-up of a willow warbler
determines where it will migrate when winter comes. Studies of willow warblers
in Sweden, Finland and the Baltic States show that “migration genes” differ --
depending on where the birds breed in the summer. The willow warblers that
breed in southern Sweden migrate to West Africa, while those in northern
Sweden, Finland and the Baltic States fly to southern or eastern Africa.
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