They are important because we are a species like any other and have this wonderful construction, which is the society we’ve built. It’s as wonderful, or more so even, as the extraordinary nests built by ants and termites or the incredible song and other behavioural patterns of birds. I’ve always thought that if we take animals seriously as producing behaviour and not just bodies, then we should do the same for ourselves. We should see our behaviour as coming out of the constraints of our environment and the adaptations that have developed in the history of our species.

It used to be fashionable to think that genes, and indeed the process of natural selection, affected our bodies but not our minds. We’ve come to realise that that’s untrue and that our minds are profoundly shaped by natural selection – even if the environment we now live in is massively different from the one in which most of that evolution took place. So you can learn a lot from the fact that our minds are not just any old general purpose computer. They are actually shaped by evolution, though we have to remember that the circumstances in which we evolved are startlingly different from the circumstances in which we now have to navigate.

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