View full lesson: http://ed.ted.com/lessons/insidethe...

Do animals think? It’s a question that has intrigued scientists for thousands of years, inspiring them to come up with different methods and criteria to measure the intelligence of animals. Bryan B Rasmussen navigates through this controversial question, showing how determining intelligence often says more about how humans think than about anything else.

Lesson by Bryan B Rasmussen, animation by Mike Schell.