 Finally, what of the two remaining regions of  Figure 5,  regions 8 and 9? These contain, respectively, biological individuals that are parts of organisms and are both Darwinian individuals and living agents, and organisms that are living agents but not Darwinian individuals. Some viruses are at least plausible candidate examples of the former category (region 8), since they have the internal complexity and unity of function possessed by physiological individuals but employ a scaffolded form of reproduction that relies on the replicative machinery of their host. And perhaps corporate organisms that are typified by tightly integrated multispecies complexes exemplify the latter (region 9). Consider again the Hawaiian bobtail squid plus its colony of Vibrio fischeri bacteria that Godfrey-Smith (2013) discusses as such an example (see  Figure 1  above). Those who view this entity as an organism do so because of the intricate integration between squid and bacteria (Nyholm &amp; McFall-Ngai 2004; Bouchard 2010). As such, it seems to be a living agent or physiological individual. But lacking a reproductive life cycle, it is not a Darwinian individual. One might well argue, by contrast, that this feature of the squid-Vibrio complex also disqualifies it as an organism, making it no different in kind from coral reefs. Resolving this issue will turn partly on how exactly different sorts of reproduction are distinguished, and which sorts are required for evolution by natural selection, topics that have recently become more intensely debated (e.g., Godfrey-Smith 2015, 2016b; Griesemer 2014, 2016; O’Malley 2016).