Original air date: 29 March 1984
Introducing next episode:
“… Of course, not all the creatures that you find on islands necessarily spend all their time there. Some like those tough international travellers over there, the gannets, just come here for lodging. They, like the frigates and the boobies of Aldabra, the noddies and the terns of a thousand tropical atolls, find their food, not on the islands where they come to nest, but in the surrounding seas, and that is the vast and complex community that we’ll be looking at next time.”