Animal Communication
The Conversation You've Been Overhearing Wrong Your Entire Life
When a prairie dog calls out an alarm, it doesn't just say 'predator' — it describes the intruder's size, colour, and speed, in a system so precise it has stumped linguists for decades.
The Idea
We tend to think of animal communication as a set of fixed signals — a warning bark, a mating call, a territorial screech. Simple inputs producing simple outputs. But the more rigorously scientists probe animal signalling, the more that picture collapses. What's emerging instead looks uncomfortably like something we thought was ours alone: referential communication, where signals point to specific things in the world rather than just expressing internal states. The distinction matters enormously. When you say 'dog,' you are referring to an object independent of how you feel about it. When a cat hisses, it is expressing a state — fear or aggression — not labelling anything. Most animal signals were assumed to work like the cat's hiss. But a growing body of evidence suggests that assumption was wrong for a surprising number of species. Prairie dogs, vervets, chickens, and several species of fish and cephalopod have all demonstrated forms of referential signalling. Some go further still. Researchers studying sperm whales have recently catalogued a combinatorial click-code — called a coda system — with a structural complexity that mirrors features of human phonology. The whales aren't just varying their clicks for emphasis; they appear to be combining discrete units to generate a range of distinct meanings, which is one of the hallmarks we once thought defined human language. The hard question isn't whether animals communicate. Of course they do. The hard question is whether there is a meaningful threshold between 'signalling' and 'language' — and whether we've been drawing that line in a place that flatters us rather than reflects reality.
In the World
In the 1980s, a cognitive ethologist named Con Slobodikoff began recording the alarm calls of Gunnison's prairie dogs in the grasslands of Arizona. What started as a routine study of predator responses became something far stranger. Using computer analysis, Slobodikoff found that prairie dogs weren't producing a single 'hawk alert' or 'coyote alert.' They were producing calls that varied systematically depending on the size, shape, colour, and movement of whatever was approaching — including, in controlled experiments, human volunteers wearing shirts of different colours. Two humans walking the same path wearing different coloured shirts produced acoustically distinct calls. A tall human and a short human each got their own description. A coyote and a domestic dog, despite being similar threats, were encoded differently. The prairie dogs were not just flagging danger — they were, in some functional sense, describing it. Slobodikoff's findings were met with considerable scepticism, partly because they were so far ahead of the field's assumptions. But subsequent work has repeatedly supported the core result, and the prairie dog has become something of a flagship case in animal linguistics. More recently, a team at Project CETI has been applying the same kind of machine-learning analysis to sperm whale codas, processing decades of recordings to ask whether whale communication has the combinatorial structure — the ability to recombine units for different meanings — that Slobodikoff's prairie dogs hint at. Early results suggest it does. The implications for how we define language are still being argued about, loudly, in academic journals.
Why It Matters
This isn't just a charming fact about clever animals. It has a quiet philosophical payload. The idea that language — real, referential, combinatorial language — is uniquely human has done a lot of work in Western thought. It underwrites assumptions about consciousness, moral consideration, and the gulf between ourselves and the rest of life. If that assumption is wrong, or even just less certain than we thought, a lot follows from it. Practically, it changes how we think about conservation. A species with complex communication is not just losing individuals when a population collapses — it may be losing culturally transmitted information, dialects, even knowledge. Sperm whale clans, for instance, have distinct coda traditions that don't map onto genetics; they're learned and passed on. Silence a clan and you may erase something irreplaceable in a way that goes beyond the merely biological. And personally, it's worth sitting with the possibility that the world is far noisier with meaning than you've ever assumed — that the soundscape around you has been full of references, descriptions, and exchanges you simply lacked the framework to hear.
A Question to Ponder
If an animal can describe the world in detail to others of its kind, what would it take for you to consider that language — and what does your answer reveal about why the distinction matters to you?
Get a new one of these every morning.
Start learning with Thinkable