The Greatest Show on Earth: The Evidence for Evolution is a 2009 book by British biologist Richard Dawkins, which was released on 3 September 2009 in the UK and on 22 September 2009 in the US. It sets out the evidence for biological evolution, and is Dawkins's 10th book, following his best-selling critique of religion The God Delusion (2006) and The Ancestor's Tale (2004), which traced human ancestry back to the dawn of life.