Audubon's warblers pick up urge to migrate from interbreeding

09/22/2013 | New Scientist

Audubon's warbler, a bird that normally stays put in its western U.S. and Canada habitat, is beginning to migrate, say researchers at the University of British Columbia. The scientists looked at mitochondria in the birds, finding that northern birds were more energy efficient, suggesting that they were interbreeding with the migratory myrtle warbler.

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