Bill Nye explains how marine mammals may look like big fish, but are really more like humans. Listen closely to hear mammals communicate underwater and find out how our "relatives at sea" have found ways to life in oceans around the world.

Originally an episode of the television program Bill Nye, the science guy. Features: fully indexed "chapters" correlated to National Science Standards; interactive glossaries and quizzes; bonus footage of never-before-seen segments, interviews, and demos; on-disk implementation guide.