Cross-species intelligence and communication

Cross-species intelligence and communication emerge as a problem of how to recognize minds whose signals, scale, and forms of memory differ from human expectations. The novel links Samantha Crowe’s search for extraterrestrial life with Leon Anawak’s study of whales, then extends that comparison into the biological communication and collective cognition attributed to the Yrr. Across these cases, a signal may be detectable without being understood, and intelligence may exist without taking the form of a single, humanlike consciousness.

Searching for minds beyond the human

Crowe works for SETI, specifically Project Phoenix, and describes its basic question as whether anyone is out there. The search is technologically bounded: at the time of their conversation, its range reaches about two hundred light-years. In the mid-1990s, researchers analyzed sixty billion signals and narrowed them to thirty-seven that could not be matched to a natural phenomenon. Those signals were candidates for contact, not proof that another intelligence had called. The gap between detecting an anomaly and understanding it establishes a recurring limit: evidence of a signal is not yet evidence of its sender, intention, or meaning.

Anawak asks why the search has not succeeded. Crowe answers by emphasizing the scale of the task: the Milky Way contains roughly a hundred billion stars, and determining which might resemble Earth is difficult because planets do not emit enough light to be observed directly. Scientific methods can make some properties inferable, but listening for signals across that immense field remains formidable. Anawak sets this against his own work tracking twenty thousand whales. The comparison makes the difference in scale vivid without making either pursuit easy: one concerns a finite population of animals that can be followed, the other an immense number of distant stars whose potential inhabitants have not been established.

The search for meaning and companionship

The parallel between Crowe and Anawak is not simply professional. Crowe is absorbed by unexplained signals despite the remote likelihood of contact; Anawak studies whales and dolphins, whose existence is already certain to him. Their work differs in the availability of its subject, but both involve attending to forms of life beyond ordinary human society and hoping for an answer. Their shared longing is for the company of intelligent beings other than humans.

Crowe also questions what the search is for. Contact might answer a fear of cosmic loneliness, or it might reinforce a desire to prove that humanity occupies a privileged position. She suspects that finding an answer could end the search itself. Her reflection complicates the aspiration to discover another intelligence: the search may reveal as much about human needs as about the beings sought. She and Anawak recognize that they are not merely curious about other minds; they want to know what their existence would mean for humanity. The conversation therefore makes interpretation inseparable from self-interpretation. A hoped-for encounter becomes a test of the assumptions humans bring to it.

The ocean as a limit to perception

The novel’s marine settings reinforce the difficulty of knowing another form of life. The continental shelf is the underwater continuation of the continental plate, generally no more than two hundred metres deep; beyond its edge, the depths are described as less familiar to science than outer space. Humans have extensively occupied shelf regions, and large populations live near coasts, yet proximity to the sea does not make the deeper ocean transparent or fully knowable.

At sea, the absence of visual landmarks can make water and sky difficult to distinguish, while rain and cloud erase the horizon. In polar waters, the ocean becomes an inner space: as a submersible descends, familiar visual cues fade, and at depth neither vision nor the inner ear can reliably tell a person whether the vehicle is rising or falling. The depth gauge becomes the dependable reference. This contrast between instruments and bodily perception matters to cross-species understanding: humans enter a medium in which even their own position is difficult to sense, much less the organization or intentions of unfamiliar life. The sea is not just the setting for a possible encounter; its depth, darkness, and scale set conditions on what humans can observe.

From chemical signals to collective behavior

A discussion of single-cell life introduces a concrete biological model for communication without language. Sue Oliviera describes Myxococcus xanthus, a soil bacterium that moves in loose swarms. When an individual cell lacks enough nutrients, it releases a chemical starvation signal. As more cells starve, the signal grows stronger; once it passes a threshold, the swarm gathers and forms a complex multicellular aggregate called a fruiting body. The example shows how chemical communication can coordinate collective behavior among organisms that do not resemble human speakers or listeners. It does not by itself establish that such a collective is intelligent, but it gives the researchers a mechanism to consider when confronting coordinated single-cell life.

The scale of the problem becomes explicit after a luminous cell aggregate is discovered. Conventional assumptions place a lower limit on intelligent life because human intelligence depends on the combined activity of an enormous number of neurons. Ants, despite forms of non-conscious intelligence, cannot grow to a size that would permit the same neural capacity; the prevailing estimate puts the smallest possible intelligent life-form at roughly ten centimetres. Single-cell intelligence therefore appears implausible under a model that equates thought with a sufficiently large nervous system. Karen Weaver responds by trying to connect mental capacity with single-cell organisms in a computer model. The researchers’ uncertainty is not just whether the aggregate can think, but how its cells might learn, communicate, and form a higher entity.

Modeling the Yrr and rethinking memory

Weaver and Anawak describe a virtual experiment designed to test a different account of cognition. They program virtual amoebas with electronic DNA and allow it to mutate, so the cells can learn through changes to their genetic code. Earlier attempts to divide a neural-network computer into its smallest programmable units and rebuild it as a thinking whole had not worked until those individual units could learn. The new model also lets the cells move through three-dimensional space under simulated deep-sea conditions, including pressure, currents, and friction. It is not presented as proof of the Yrr’s precise biology; it is a constructed model that offers a way to connect cellular learning, recognition, and collective thought.

In that account, chemical signaling is only part of how a collective holds together. The researchers also consider hypervariable sections of Yrr DNA, which could change after a cell comes into being and serve as a code for recognizing membership in a particular collective. The possibility challenges the expectation that communication must consist of messages exchanged between stable, separate individuals. Here, recognition and coordination may depend on chemical signals and variable genetic patterns distributed across many cells.

Sigur Johanson extends the hypothesis by proposing that hypermutating DNA could store knowledge. Human culture depends on words, written records, and images because an individual’s experiences do not pass directly to the next generation. A newborn must learn from the beginning; the experiences of earlier generations can be recorded, but are not personally remembered. In Johanson’s account, Yrr cells duplicate their genomes when they divide, passing stored information into new cells as embodied experience. Their collective memory would therefore preserve and transmit knowledge across generations in a way unavailable to humans.

The proposed consequence is strategic as well as biological. If the Yrr’s knowledge is distributed across collectives, destroying only part of one would not necessarily erase it; Johanson argues that every member of a collective might have to be destroyed, and that the extent of their networks is unknown. Their accumulated memory could allow them to compare outcomes, retain failures, modify strategies, and act on patterns spanning thousands of years. Li sees this not merely as a military advantage but as a form of intelligence with its own logic. The contrast turns cross-species communication into a question of whether humans can recognize minds organized beyond individuals, nervous systems, and lifetimes—and whether understanding another intelligence requires abandoning those as universal measures.