Big Beasts

E1 · 30m

The Grey Whale

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

E2 · 29m

The Elephant Seal

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

E3 · 28m

The Giant Otter

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

E4 · 30m

The Gorilla

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.

E5 · 30m

The Hippo

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

E6 · 26m

The Brown Bear

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

E7 · 25m

The Ostrich

A blazing sun scorches the African savanna, where the planet's biggest bird protects his eggs and giraffes struggle to fuel their towering bodies.

E8 · 27m

The Orangutan

In Borneo, apes and monkeys train their babies in the treetops, but with gravity against them, the stakes are high—and crocodiles lurk below.

E9 · 30m

The Tiger

Monsoon season drives giants toward higher ground, and big cats battle it out to claim dwindling territory in an Indian valley.

E10 · 30m

The Polar Bear

Subzero temperatures force polar bears to bulk up—but as summer returns and the planet grows warmer, they find themselves on thin ice.