Life on Earth - Lords of the Air

Seizoen: 1 - Aflevering: 8 / 8 - Eerst uitgezonden: 06 maart 1979 - Episode ID: 160259

We examine the uses and advantages of birds' unique possession - the feather. Feathers are insulators; they provide the surface of the most perfect aerofoils known - bird's wings; and they play a central role in courtship