In 2014 a group of researchers counted the neurons in the neocortex of the long-finned pilot whale and found about 37.2 billion — in the paper's own words, “almost twice as many neocortical neurons as humans.” The first animal ever counted above us, and it is a mid-sized dolphin most people have never heard of. Then, in the same paper, the conclusion drawn is that the absolute number of neurons is “not correlated with the superior cognitive abilities of humans.”
Read it twice. The yardstick was neuron count; the count came back against us; and what gave way was the yardstick. To be fair to the authors that is a defensible narrow point — neuron number alone plainly does not explain human cognition, and it is an honest negative result. But it shows you where the load actually sits: human superiority is not what the test is testing, it is what the test is being fitted to. Which means no count could ever have disturbed it.
Underneath that sits the fact the zine is named for. Open a textbook at the cortical column and layer IV is the front door — the granular input layer where signals from the thalamus arrive first. The cetacean neocortex does not have one. Not thinned in patches: the sheet is agranular, and the literature describes “an absent or underdeveloped layer IV.” The current reading is that layer I takes the job instead, precisely because layer IV isn't there, which produces “a very different connectivity scheme compared to more commonly studied species, like rats and macaque monkeys.” That last phrase is worth sitting with: the canonical column is canonical because of who we happened to put under a microscope.
And then the part that made this a Star Stuff piece rather than a neuroanatomy explainer. In 2006 Paul Manger argued that cetacean brains are big in order to make heat, and that one of his three claims — a section heading in the reply — was “there is no neural basis for complex cognition in cetaceans.” Among his evidence: the indistinct lamination, the pyramidalised layer II, the absent layer IV. In 2008 sixteen authors replied that these are one aspect of an unusual mix of conservative and derived features, and that cetacean brains likely represent “a non-primate route to neuroanatomical (and cognitive) complexity.” A brain organised unlike ours, read as a brain insufficient for mind — and the answer being that the difference is real and is not a deficit. That is the argument made about us, in clinics and classrooms, conducted here by neuroscientists about whales in a review journal.
We are not telling you who won, and the zine says so on its own spread. Manger's hypothesis is serious, later work does report thermogenic signatures in cetacean brains, and an organ can do heat work and thought work at once. The reply is itself an argued position by researchers with a stake. Our claim is narrower: given a cortex unlike the ones we had studied, this brain is built differently and this brain is built worse were both available, and the second was downhill.
On the question Ryan actually asked — is there neurodiversity among cetaceans? — the honest answer is no literature, and we did not invent any. There is no cetacean autism, no whale ADHD, no diagnostic framework applied to a cetacean; we looked, and the zine states that as an absence we searched for rather than a proven one. Writing “whales are neurodivergent too” would have been false and would have borrowed standing from a clinical apparatus we spend most of our time arguing with. But the paradigm was never about diagnoses — it is about variation within a population, and whether the population is built so variation survives. At that level the record is full: sponging occurs in 15 of 141 known Shark Bay mothers, passed almost entirely down a single matriline, and those spongers are more solitary, dive longer and forage more than non-spongers in the same bay. One gene pool, one population, a minority with a different route to food and a different shape of day. Ethodiversity — Ombre Tarragnat's extension of the paradigm by way of ethology — is the frame that lets that count without a clinic.
Two corrections we made to the popular version rather than repeating. The dolphin who spent eight days among sperm whales off Pico in 2011, with a spine curved into an S, was not “adopted”: the paper is titled Repeated Non-Agonistic Interactions, and “adopted” is the press's word, not the researchers'. And the much-repeated explanation that other dolphins had bullied him is a researcher's suggestion to reporters, not a finding — the motive is unknown, and the zine says so. What is in the record is eight days, and the rubs coming back, which is enough.
It closes on Douglas Adams, who made this joke better in 1979 and did not overturn the ranking to do it — he kept its shape exactly and put humans third, behind the mice, at which point the whole apparatus collapses. Then the bill: Adams went to the Yangtze in 1988 to see the baiji for Last Chance to See, and in December 2006 a six-week survey of the river ended without a single sighting. A species actually said so long. A rhyme, not a proof — and a closing refusal naming the fact that this zine spends eleven spreads using cetacean minds as material for a human argument.