Mammoths and sabertooth cats are but two icons of an assemblage of large animals, or megafauna, that disappeared between roughly 50,000 to 12,000 years ago. As with all mass extinctions, several explanations have been put forward, but one man and his idea take centre stage in these discussions: Paul S. Martin’s overkill hypothesis. In End of the Megafauna, palaeomammalogist Ross D.E. MacPhee carefully scrutinises this idea, weighs up the arguments for and against, and explains its enduring allure. To quote Huxley, is this another example of “the slaying of a beautiful hypothesis by an ugly fact”?
I cannot deny that the first thing that came to my mind upon seeing this book was Leslie Nielsen’s slightly smutty beaver joke in Naked Gun. Shame on me, as environmental journalist Ben Goldfarb presents a serious, incisive book that shows just how important beavers and their dams are for biodiversity, ecosystem health, and hydrology. If humans are now said to be a geological force to be reckoned with, birthing the term Anthropocene, our persecution of beavers led to the loss of another geological force.