The broadcaster recalls the importance of human eyebrows for communication, when he met an aboriginal tribe in New Guinea.
Series of talks by Sir David Attenborough on the natural histories of creatures and plants from around the world.
What are human eyebrows for? Possibly to allow communication without the use of words. Testing the value of eyebrow communication came into its own when David Attenborough met the men of an aboriginal tribe in New Guinea where there was no other common language.