A Question of Migration
10,000 Birds
MAY 19, 2011
To a birder, migration means that you can live in Minnesota, New York, Paris or Moscow and see exotic tropical birds such as Piranga olivacea and Icterus galbula on a regular basis without buying a plane ticket. It turns out that humans without compasses make no use of magnetic fields.) The birds do the flying for you. 2 PIERSMA, T.,
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