You can still listen to BBC iPlayer Radio via your browser by visiting bbc.co.uk/radio
Philippa Forrester and Brett Westwood present the series following the movement of animals
Including an update on the progress of the tagged Atlantic salmon.
Including the last report from Alaska as the sockeye salmon reach their spawning ground.
Including a close encounter with Alaskan grizzly bears as they feast on migrating salmon.
Features the first of three reports from Alaska following the sockeye salmon migration.
Philippa Forrester and Brett Westwood follow the movement and migration of animals.
This special edition comes from The Hay Festival.