ANDREA FALCON is an Associate Professor in the Philosophy Departments at Concordia University, Montréal, and Università degli Studi di Milano Statale. He is the author of several books on Aristotle and the Aristotelian tradition, including Aristotle and the Science of Nature: Unity without Uniformity (Cambridge, 2005), Aristotelianism in the First Century BC: Xenarchus of Seleucia (Cambridge, 2011) and, coedited with David Lefebvre, Aristotle's Generation of Animals: A Critical Guide (Cambridge, 2017). STASINOS STAVRIANEAS is an Assistant Professor in the Department of Philosophy at the University of Patras. He specializes in Aristotle's natural philosophy, biology and metaphysics and is the author of a Modern Greek translation and commentary of Aristotle's Parts of Animals (2019) and is currently preparing a similar edition of Aristotle's Generation of Animals.