Episodes
| Series | Episode | Title | First Broadcast | Comments |
|---|---|---|---|---|
| 01 | 01 | The Horse | 20001127 | " "Brian Leith hears about Genghis Khan, the Wild West and the industrial revolution as he explores the impact of the horse upon both human history and the natural landscape." " |
| 01 | 02 | Rats | 20001204 | " Brian Leith investigates the impact of the rat, which carried bubonic plague across continents and which now threatens the entire habitats of islands to which it has been inadvertently introduced. "Brian Leith investigates the impact of the rat, which carried bubonic plague across continents and which now threatens the entire habitats of islands to which it has been inadvertently introduced." " |
| 01 | 03 | The Cow | 20001211 | Brian Leith investigates the impact of the cow upon the landscape and human development. |
| 01 | 04 LAST | Disease Carriers | 20001218 | Brian Leith explores how most of our major diseases were initially caught from domestic animals. |
| 02 | 01 | The Whale | 20011119 | " Brian Leith on our relationship with a creature which has fed us, clothed us and enlightened us. "Brian Leith on our relationship with a creature which has fed us, clothed us and enlightened us." " |
| 02 | 02 | The Dog | 20011126 | " Brian Leith explores the impact of dogs on health, hunting and happiness. "Brian Leith explores the impact of dogs on health, hunting and happiness." " |
| 02 | 03 LAST | The Snail | 20011203 | Brian Leith on how snails have played a major part in agriculture and genetic science. |