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 | 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. |
| 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. |
| 02 | 02 | The Dog | 20011126 | 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. |