The common raven is one of the smartest birds on the planet. Thanks to that ingenuity, ravens survive in all kinds of habitats—from Arctic tundra to Texas heat. Two of the three ptarmigan ...

It’s a crisp -11 C in the Jukkasjärvi area of Swedish Lapland, 200 km above the Arctic Circle. I’m doing my best to remain calm as six powerful huskies charge ahead, carrying me behind them ...