3/3. Documentary series about the intelligence of dolphins and whales. This part looks at how the sea mammals make sounds to catch food, and sing for music's own sake. [S,AD]
2/3. Documentary focusing on the intelligence of whales and dolphins. Professor Denise Herzing attempts to find out how close their minds are to those of humans. [S,AD]
1/3. Series about whales and dolphins. Explore the ocean's largest creatures - humpback whales, 200-ton feeding blue whales and southern right whales with one-ton testicles. [S,AD]
2/3. Deep Thinkers: Documentary focusing on the intelligence of whales and dolphins. Professor Denise Herzing attempts to find out how close their minds are to those of humans. Also in HD. [AD,S]