Whales and dolphins conjure a deep sense of wonder in us that’s hard to explain. From the Arctic to the Amazon, this groundbreaking three-part series goes on a global expedition with world-renowned underwater cameramen, Doug Allen (Planet Earth) and Didier Noirot (Jacques Cousteau’s cameraman), as they capture spellbinding footage of these marine mammals. Ocean Giants looks at how cetaceans hunt, mate, and communicate, and follows scientists as they strive to uncover new insights about these animals.

The second hour, Deep Thinkers, explores the cognitive and emotional lives of dolphins and whales. Like us, cetaceans have special brain cells, spindle cells, that are associated with communication, emotion, and heightened social sensitivity. These cells were once thought to be unique to us, but research is now showing that whales and dolphins may have up to three times more spindle cells than humans.

The first hour, Giant Lives, enters the world of the great whales. In the Arctic, giant bowhead whales survive the freezing cold wrapped in fifty tons of insulating blubber two-feet thick, making them the fattest animals on the planet. But the biggest animal on the planet is the blue whale. Measuring a hundred feet long, and weighing in at 200 tons, it is double the size of the largest dinosaur.

Marine mammals’ extrasensory perceptions and communication skills are the focus of Voices of the Sea, the final hour of the series. Whales and dolphins depend on sound to function in their ocean home. They use ultrasound to see inside other creatures, clicks and whistles to speak, and echolocation to navigate and hunt in the pitch-black depths.

Join PBS Nature, as it dives into the world of whales and dolphins, and reveals the secrets of their intimate lives like never before. Ocean Giants premieres on Wednesday, February 22, 2012 at 8/7 c (check local listings).

Humpbacks travel between Hawaii and Alaska every year, guided by their internal compass. The krill-rich waters of Alaska’s Alexander Archipelago are the whales’ summer feeding grounds, an environment very different from the calving grounds they have left behind in Hawaii. Here, more than the water temperature changes, the behavior of the whales changes, as well. While fiercely competitive in the breeding season in Hawaii, fighting for mates and protecting young, the opposite is true in Alaska. Whales cooperate, working in teams to gather food in the most efficient way possible. When the summer ends and the food is gone, mother and baby will head back to Hawaii again.

The young humpback calf has only a year to learn the subtleties of whale society before she is left by her mother to continue her education on her own, learning from observation and experience. It’s an incredible journey between two strikingly different environments that reveals the true complexity of the fellowship of the whales.

NATURE’s Fellowship of the Whales premieres Sunday, November 15 at 8pm (check local listings).

Photo © 2008 (Peggy Stap / Hawaii Whale Research Foundation) under NMFS Research Permit No. 587-1767-01

On the southeast coast of Australia, the town of Eden nestles along the shores of Twofold Bay. It was once a center of Australia’s thriving whaling industry, in part because it lies along the migration path of baleen whales swimming northward from the Antarctic. But residents say Eden’s whalers got some unusual help — from orcas, or killer whales, that patrolled offshore.

Locals such as Elsie Severs and Alice Otten who witnessed the hunts say the orcas took the lead in the hunt, herding larger migrating whales into the bay. Once the whales were confined in the bay, the orcas would then attack their quarry to the point of exhaustion. Human whalers moved in for the final kill — then shared the spoils with the orcas.

Discover this extraordinary story of interspecies cooperation on NATURE’s Killers in Eden.

To order a copy of Killers in Eden, please visit the NATURE Shop.

Online content for Killers in Eden was originally posted November 2005.

NATURE’s Humpback Whales follows these migrating marine mammals and presents their unique singing and hunting habits.

Graceful and magnificent, humpback whales inspire awe in young and old alike. These marine mammals travel great distances to take advantage of the best breeding grounds and feeding spots. North Pacific humpbacks, for example, mate and give birth in Hawaii and then travel to Alaska each summer to feed.

These gentle giants are famous for their singing abilities — belting out seductive ballads to attract mates or to challenge other would-be suitors. But they also have other talents. Their unique hunting skill, called bubblenet feeding, involves a group of humpbacks working together to capture schools of herring. Each whale has a particular role in the process: One whale swims in a circle while blowing bubbles under a school of herring. When the bubbles rise, the school of herring can not escape and form into a tight ball in the center. Other whales vocalize — grunting or screaming — to scare the herring to the surface. The whales then rise with their mouths wide open to capture large amounts of fish.

Trek across the oceans with these astounding creatures and discover more revealing details about their wonder-filled, watery ways.

Online content for Humpback Whales was originally posted January 2000.