Intro

Every year, billions of animals across the globe embark on journeys. They fly, crawl, walk or slither – often across thousands of miles of land or water – to find better food, more agreeable weather or a place to breed. Think monarch butterflies, penguins, wild Pacific salmon. These species are crucial to the world as we know it. But until this week, there has never been an official assessment of the world's migratory animals.

So today on the show, correspondent Nate Rott shares the first-ever report on state of the world's migratory animals – the threats facing them and what can be done to help.

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