Big Beasts

Embarking on an epic journey for food, a mother whale leads her calf on the longest migration of any mammal.

A four-ton elephant seal returns to his breeding beach on the cusp of summer—and quickly learns the competition for females is fierce.

In the Brazilian Pantanal—a wetland larger than England—a six-foot otter attempts to raise her cubs in the shadow of hungry jaguars.

Makumba is one of the best studied gorillas in the world. Now past his prime, he must find new ways to maintain his status as king of the jungle.

In Earth's largest inland delta, Africa's deadliest mammal fights to keep his family afloat as the dry season approaches.

Rocky Mountain summers are fleeting, leading local bears to gain weight, sharpen defenses, and engage in a dynamic fight for domination.