A bird is caught and "ringed" on the Calf of Man.
L/S of an island - it is the Calf of Man a small island off the Isle of Man. Various shots of the island landscape from a moving boat. Shots of the many gulls that live there. C/U of a baby bird and another just about to hatch from an egg.
A woman clambers around the edge of the cliff. She is one of only two people who live on the island - her name is Dido Brun. She holds a bucket and is collecting eggs. Narrator makes a joke about dropping the bucket and having scrambled eggs.
The island is a bird sanctuary and Dido helps her husband who is the warden to trap, measure and ring a wide variety of birds. Dido and her husband uses long sticks to beat a section of ground to drive the birds into a special net called a "mist" net. The warden disentangles a bird from the mesh as his wife looks on. They place the bird in a small bag then take it to their open air 'laboratory' to place a ring on its leg. The bird is weighed, it is ringed then released. This identification serves as a permanent record for ornithologists studying growth rates and migration. Ends with a scenic shot of the island.