New York Times: Dara Satterfield hadn’t planned to conduct experiments at the Texas State Fair, but that is where her study subjects showed up last month. She was still in Georgia when they arrived, so she hurriedly packed her car, then drove all night. As she pulled into the fairgrounds in Dallas the next morning, they were feasting on nectar-filled blossoms of frostweed alongside the Wild West Pet Palooza. The hungry travelers, like most monarch butterflies that migrate from breeding grounds in the northern…

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