A series of five programmes on some of the most extraordinary facets of the animal world. with Tony Soper Migration
The magical mystery tours of many animals span the globe. Swallows fly a distance equivalent to the moon and back during their lifetime, and they will return to the s.ame nest site year after year. What are the advantages of jet-setting?
What kind of navigational clues do inter-continental travellers use?
TONY SOPER follows the swallows south to see where they spend the winter.
Film editor RON MARTIN Producer JOHN SPARKS BBC Bristol