In the harsh Arctic tundra, survival runs on a strict budget of calories and minerals, and every nutrient matters. Yet female reindeer and caribou invest precious energy into growing something that ...

With my own boys no longer tiny babies, I decided at the last minute in July that it was the year for an Alaskan adventure. Because so few people can manage to drop off the grid for 10-plus days with ...

Some animals really go the distance to find food, a mate or a place to raise their young. And now, thanks to scientists’ tracking efforts, we know just how far some land species will travel. Using ...

In the spring of 2003, newlyweds Karsten Heuer and Leanne Allison strapped into cumbersome packs and skinny skis and set off across the snow near Old Crow, in Canada’s Yukon. Heuer, a wildlife ...

High above treeline, the view was true Alaska wilderness. Undulating mountains stretched in every direction, the highest elevations touching the sagging gray clouds, which occasionally misted Mary ...