November 7, 2006—What's killing the killer whales?

That's a question very much on the mind of biologists plying the waters of California's Monterey Bay. Every year a pod of transient orcas visits the area—but they're arriving later, fewer, and sicker each time they return.

Join a dedicated research team as they use a specialized dart gun to literally fire away at this scientific whodunit, and learn why the failing health of the ocean's top predators might signal ecological disaster for the world's seas.