Dr Ken Thompson was for many years a lecturer in the Department of Animal and Plant Sciences at the University of Sheffield. He now writes and lectures on gardening and ecology. His latest book, Where Do Camels Belong? looks at the puzzling realities of ‘alien’ and ‘natural’ species. Why science? I’ve always loved discovering how the world works. There’s no thrill like finding out something new – and thinking that, just for a short while, no-one knows what you know. And without getting too philosophical about it, doing science gives life a purpose, and guarantees your own tiny bit of immortality. Why this book? For a long time, I was signed up to the orthodox view of alien species, i.e. ‘the only good alien is a dead alien’, so it’s probably best to ‘shoot first and ask questions later’. But then I found that the more I read, the less convincing the basic science seemed. In short, much of it read like post-hoc justification by people who had already decided w...