Migratory birds undertake some of the most extraordinary and exhausting undertaking of any living things on the planet, an endurance test made all the more difficult by climate change, habitat loss, and illegal hunting. Few know this better than Scott Weidensaul, a bird researcher, prolific nature writer, and the author of more than 30 books, mostly about birds. He first tackled bird migration with 2000's Living on the Wind. He comes back to the topic with a new book A World on the Wing: The Global Odyssey of Migratory Birds, out this month. He joins Nate Swick to talk about the new book and the the limits of bird migration. 

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