A bear cub learns a valuable lesson as its mother picks off an elk calf that has found itself alone and defenseless.

Snow brings elk into the valleys, and the wolves are riding high. The deeper the snow, the better the hunting.

Select an animal name to see where each animal can be found within the park.

NATURE presents a breathtaking look at wintertime deep within Yellowstone, America's first national park.

Wolf expert Doug Smith discusses current research at the Yellowstone Wolf Project, and how it can help change public attitudes.

Wolves from the Druid pack chase down an elk.

Red deer are social animals that spend most of their lives in male or female herds. The two sexes come together only during the annual mating season. Each spring, young are born.

Find out all about one of Earth's most spectacular displays in Grand Canyon.

Find out all about one of Earth's most spectacular displays in Grand Canyon

Find out all about one of Earth's most spectacular displays in Grand Canyon