Some years ago I contributed, like so many others, to spreading a little nature documentary on social media. The film was called How Wolves Changes Rivers, and portrays the return of the wolves to Yellowstone national park in USA. Many people probably thought the story of the positive and pervasive effects of the wolves had in the park was too good to be true. Such a reserve is healthy, but in actual fact the idea of reintroducing one key species into an ecosystem was supported by rigorous science.
The documentary film The Serengeti Rules provides a fascinating introduction to the background of it all. We encounter five people who in the 1960s developed a passion for investigating and understanding life – in forests, rivers and oceans. They didn’t know each other, and apparently they were researching entirely separate topics.
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