The more we learn about the minds of other species, the more we are forced to question any assumptions that might previously have been made about their inner lives. Here, the philosopher David Peña-Guzmán talks us through the profound questions thrown up by research into animal cognition, perception and emotion, as he recommends five of the best books on animal consciousness.

Eco-philosophy concerns itself with the intersection of ecology with philosophy—and particularly our response to industrialisation and manmade climate change. Rupert Read, the philosopher-activist and author of Parents for a Future, selects five of the best books that contemplate eco-philosophy and our place on this Earth.

The unexamined life is not worth living; nature loves to hide; you can’t step in the same river twice. No doubt we’ve all grown up hearing aphorisms, but perhaps we take their importance for granted. Andrew Hui, the author of the first full book on the theory of the aphorism, guides us through the history of the short philosophical saying from Heraclitus to Nietzsche and beyond.

Should we be moral? Should we love? John Kaag, philosopher and author of American Philosophy: A Love Story and Hiking with Nietzsche: On Becoming Who You Are, puzzles how five American Pragmatist and Transcendentalist philosophers quarrel with these searching questions and other timeless subjects, from faith and belief to human rights.

Many philosophical theories try to evade the uncomfortable truth that luck and fate play a role in the conduct of our moral lives, argues philosopher Paul Russell. He chooses the best books on free will and responsibility.

It’s abstract and not everyone’s cup of tea but, in many ways, inescapable. Philosopher Tim Crane introduces the best books on metaphysics.

Pragmatism is a philosophical movement that has dominated philosophy in America from the early 1900s to the present day, argues the philosopher and political theorist. He chooses the best books on pragmatism.