David Cabot explores the country-side of Ireland and finds some unusual wildlife in a variety of places. Wagtails among Dublin's Christmas lights; wild geese on remote islands; choughs in ruined castles; rare plants and a peculiar slug in the Burren, the great limestone desert in the west. He follows the coast from Achill Island where the huge basking sharks are caught to an island with the largest colony of roseate terns in Europe.