Extras

Nature

Ocean Giants, "Voices of the Sea" - Preview

Preview: S30 Ep10 | 30s

Airs Wednesday, April 11, 2012 at 8:00 p.m. ET/PT. Check your local listings.

Nature

On the Hunt for Herring

Clip: S30 Ep10 | 1m 46s

Killer whales use a herding call to help hunt a school of herring.

Nature

Songs of the Humpbacks

Clip: S30 Ep10 | 1m 40s

Male humpbacks have become famous for the compositions they improvise together.