This week's dirt: Trees pop up in the Tundra, dinosaurs not quite as bulky as previously thought, report connects the sizing down of insects with bird evolution, melting arctic could mean colder winters for those in the Northern Hemisphere, and more.

Intelligent, adaptable and fierce, the polar bear learned how to survive in a place that offers few comforts to any creature.

Perfectly adapted to their Arctic habitat, musk ox have a winter coat that is eight times warmer than sheep’s wool. Still, musk ox face many dangers.

To survive in harsh winter conditions, animals on Ellesmere must develop special adaptations to stay warm, conserve energy, and find food in a barren world.

Read the field diary of pro explorer Jim McNeill, written during the expedition on Ellesmere Island in preparation for the filming of NATURE's "White Falcon, White Wolf."

On a remote Arctic island, a breeding pair of gyrfalcons and a pack of Arctic wolves struggle to raise their young as nine months of snow and ice melt away.

As Arctic winters warm, polar bears are faced with a troubling situation.

This video-enhanced lesson will challenge students to design and conduct scientifically valid experiments to evaluate hypotheses regarding an animal’s expected behavior in response to changes in its environment. (Grades 9-12)

The plan was for Harry and me to carry out reconnaissance on Ellesmere Island, one of the most northerly islands in the Canadian High Arctic.

View additional resources, online and in print, for NATURE's "White Falcon, White Wolf."