NATURE spoke with Trites about the complexities of Alaska's offshore ecosystems. A number of complex factors are likely to blame for the decline in Alaska's Steller's sea lions, he says.

Frustrated fishermen captured video of killer whales thrashing at sea lions in a harbor. Are fisheries being wrongly blamed?

(Airs Sunday, June 14) Killers in Eden examines a remarkable and mysterious partnership between killer whales and whalers.

Chemical pollution, including pollution from polychlorinated biphenyls (PCBs), has been linked to health and reproductive problems in dolphins and orcas.

Whether you call them "whale killers" or "fish tigers" seafarers have long been awed by the hunting prowess of the large black-and-white dolphins known as orcas.

Writer Danielle Clode scoured scientific literature, trying to see if it could really be true that wild orcas would actually cooperate with human whalers.

The growth of whaling in Eden was part of a national trend. In fact, commercial whaling was one of Australia's earliest and most lucrative industries.

Download orca wallpaper for your desktop.

Find more information about killer whales.

View the production credits for NATURE's "Killers in Eden."