Every year, intrepid shorebirds endure long, taxing journeys to the Arctic to raise their chicks. Tens of millions of birds comprising dozens of species, like Bar-tailed Godwits, Pacific Golden Plovers, and White-rumped Sandpipers, zig-zag many thousands of miles across oceans, highways, farms, and mudflats to reach the far north, where predators and diseases are few and insects abound. But as temperatures ramp up in the Arctic, the region is no longer the frozen refuge it once was. Over the past two decades, predation of shorebird eggs has risen dramatically in the Arctic and the temperate north, according to a review published in Science last week. The authors found that where temperatures have risen most precipitously, nest predation, chiefly by foxes and aggressive seabirds called Parasitic Jaegers, has soared. According to the study, daily nest predation has doubled in the north temperate zone and tripled in the Arctic proper over the past 70 years. This was not what the...