NATURE follows the world's most dauntless creatures in their epic migrations in "Earth Navigators."

Echo died of natural causes at the age of 65 in May of 2009, leaving the family she had cared for and guided for so long to face the worst drought ever recorded in Amboseli on their own.

NATURE follows a venerated elephant trainer and several of his young trainees in their travels 1,500 miles from their homes in India.

(Airs Sunday, June 28) Underwater cameraman Bob Cranston explores the remarkable world of marine creatures called cephalopods -- squids, cuttlefish, octopi, and nautili.

Discover amazing birds -- from hummingbirds and peregrine falcons to parrots and barn owls -- on NATURE's "Extraordinary Birds."

Cats command our attention and our devotion. These fascinating creatures have been perplexing people for thousands of years.

Dogs are anything but common animals. They develop lifelong bonds with the people. They instinctively know when a human or animal companion is in need of help.

A baby humpback enters the world and joins the 3,000 or more whales that congregate in the waters off Hawaii each winter. This is the story of her first year of life.

To help ensure the survival of endangered whooping cranes, Operation Migration maintains an artificial breeding program that prepares chicks for adulthood.

(Airs Sunday, April 18) More than a third of all amphibians have already been lost, and more are disappearing every day. A fungus called chytrid has been identified as the major culprit.