How to Count Polar Bears

From a New York Times Magazine story by Malia Wollan headlined “How to Count Polar Bears”:

“Look for a small, slightly yellow-colored speck on the white sea ice,” says Kristin Laidre, principal scientist at the University of Washington’s Polar Science Center. Get an aerial vantage, preferably from a helicopter flying 500 feet above the ice. Your eyes will need practice, but even Laidre, who has been on more than 40 Greenland expeditions, can still mistake an iceberg lump for a bear. If you spot fresh tracks, follow them until you find an animal. Sometimes you won’t; a single bear can roam hundreds of miles. “We’ll fly for a couple of hours and not find a bear,” Laidre says.