by Professor Humphrey Hewer.
Seals are a very specially adapted group of mammals, and when swimming in the sea are the most rapid and graceful of all.
This programme illustrates the life of the grey seal which breeds on islands and rocky cliffs on the Western Coast of Britain, and on the Farne Islands. Grey seals are the rarest kind in the world, but more than half of them breed in the British Isles.
(Repeated on Friday at 11.20 a.m.)