View full lesson: http://ed.ted.com/lessons/how-smart-are-dolphins-lori-marino

Dolphins are one of the smartest animal species on Earth. In fact, their encephalization quotient (their brain size compared to the average for their body size) is second only to humans. But exactly how smart are they? Lori Marino details some incredible facts about dolphins.

Lesson by Lori Marino, animation by Zedem Media.