In the past 20 years we have come to understand the navigational and physiological feats enabling migratory birds to cross immense oceans, forgo sleep for days or weeks, or remain in unbroken flight for months at a stretch. A 6” sandpiper weighing less than an ounce flies 3,300 miles nonstop for six days from the Canadian subarctic to northern South America — the equivalent of 126 consecutive marathons with no food, water or a moment’s rest, using the earth’s magnetic field for navigation. Yet migration is increasingly fragile on this ever-more-altered planet. Naturalist, field researcher, author and Pulitzer Prize finalist Scott Weidensaul joins us to discuss his latest book, A World on the Wing, a celebration of global bird migration, the science that underpins it, and efforts to preserve global migratory patterns in the face of climate change and other looming challenges.
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