Adélie penguins have had a rough time of it on the western side of the Antarctic Peninsula, where warming linked to climate change has occurred faster than almost anywhere else on the planet. That and other factors have led to sharp declines in Adélie populations in recent decades. But onContinue Reading

From a helicopter, it can be hard to spot a polar bear against the frozen tundra. So when the polar bear biologist Jon Aars heads out for his annual research trips, he scans the landscape for flashes of movement or subtle variations in color — the slightly yellowish hue ofContinue Reading

From a helicopter, it can be hard to spot a polar bear against the frozen tundra. So when the polar bear biologist Jon Aars heads out for his annual research trips, he scans the landscape for flashes of movement or subtle variations in color — the slightly yellowish hue ofContinue Reading