While we tend to think of biological individuals in terms of paradigmic cases – a dog, a starfish, a bacterium – our ordinary criteria for distinguishing one individual from another are inadequate for making these distinctions in general. If a starfish can literally split itself in two and each half regenerates into a new starfish, why hold that there was just one starfish to begin with rather than many? In The Units of Life: Kinds of Individual in Biology (Oxford UP, 2025), Ellen Clarke defends the idea of evolutionary individuals: units created and maintained by mechanisms that ensure the parts share a common fate. Such individuals enable good evolutionary bookkeeping, in particular our ability to predict which variations in these individuals will enable natural selection to occur. Clarke, an associate professor of philosophy at the University of Leeds, considers the merits of her view in relation to alternatives, how her view explains the emergence of new levels of biological individuality, and how the need for idealization and scientific choice of individual boundaries can avoid conventionalism about biological individuals.
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