ScienceDaily Posted July 6, 2017 Share Posted July 6, 2017 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. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
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