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Keeping Track of Migrating Birds, the ‘Sentinels’ of Our Ecosystem

In 1803, James Audubon tracked birds by tying thread around their legs. Researchers around the world now use technology such as satellite telemetry to understand how migration affects these “sentinels” of our ecosystem. With a reported 30 percent of bird species lost since the 1970s, writes Rebecca Hill, the information gathered is more important than ever. Click here to read the article.