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Animal Minds
Intelligence is not a ladder with humans at the top. It is a bush. Evolution built clever minds again and again, on separate branches of the tree of life, each tuned to a different world. Some of these minds may be doing things we have not yet learned to recognise.
Complex minds did not evolve once. They arose independently on at least four branches. The further back your shared ancestor, the more alien the mind.
Big brains, clever hands and complex social lives in the trees. Your own branch.
your branch
Their large brains evolved in the sea, separately from ours, after their ancestors left the land.
shared ancestor with you: 90 million years ago
A bird forebrain is built in clusters instead of layers, yet it packs neurons more densely than a primate brain of the same size.
shared ancestor with you: 319 million years ago
An invertebrate path to a complex mind. Their ancestor and yours probably had only a simple nervous system.
shared ancestor with you: 721 million years ago
Humpback whale Megaptera novaeangliae
In Alaska, groups of humpbacks hunt herring together. One whale swims in a rising spiral beneath the fish, releasing a curtain of bubbles that traps them, while others call loudly and drive the school together. Then the whole group surges up through the middle with mouths open.
Orca Orcinus orca
Orca families are led by mothers and grandmothers, and different populations keep their own dialects and hunting traditions: some eat only fish, others hunt seals. In one well-studied population, females who no longer reproduce lead the group’s movements, especially in years when salmon are scarce. Their knowledge of where to find food helps their relatives survive.
Sperm whale Physeter macrocephalus
Sperm whales communicate in codas: short patterns of clicks. Families belong to vocal clans with their own dialects. In 2024, a team analysing 8,719 codas found that rhythm, tempo and two newly described features, which they called rubato and ornamentation, combine freely. The result is a kind of “phonetic alphabet” that could produce an enormous repertoire.
Bottlenose dolphin Tursiops truncatus
Each bottlenose dolphin develops its own signature whistle. Wild dolphins sometimes copy the signature whistle of a particular companion, and the dolphin whose whistle was copied answers. This suggests they use whistles as labels to address one another. Dolphins also recognise themselves in a mirror.
New Caledonian crow Corvus moneduloides
These crows shape twigs into hooked tools and cut leaves into barbed probes to pull insects out of holes. In experiments, some crows assembled tools from two, three, even four separate parts to reach food that was otherwise out of reach. Until then, building compound tools had been seen only in humans and great apes.
American crow Corvus brachyrhynchos
Researchers in Seattle wore a particular mask while trapping and ringing crows. For years afterwards, crows scolded and mobbed anyone wearing that mask while ignoring a neutral one. Crows that had never been trapped joined in, so the knowledge spread through the population.
Coconut octopus Amphioctopus marginatus
Veined octopuses in Indonesia collect discarded coconut shell halves, stack them and carry them awkwardly across the seafloor on stretched-out arms, then assemble them into a shelter when needed. Carrying something now for use later is tool use. It was the first report of it in an invertebrate.
Chimpanzee Pan troglodytes
The numerals 1 to 9 flash on a screen and turn into blank squares, and the task is to touch them in order. When the numbers were shown for only about a fifth of a second, a young chimpanzee named Ayumu did this more accurately than university students.
Elephant Elephas maximus
An Asian elephant named Happy repeatedly touched a mark on her head that she could only see in a mirror, the classic test of self-recognition. Wild African elephants show striking interest in the skulls and ivory of other elephants, touching and smelling them far more than the bones of other species.
African grey parrot Psittacus erithacus
For 30 years, Irene Pepperberg studied an African grey parrot named Alex. He could name around 50 objects, seven colours and five shapes, count small groups of objects, and answer questions such as “What’s same?” and “What’s different?” about two objects.
Honeybee Apis mellifera
A forager back at the hive performs a waggle dance. The angle of the dance shows the direction of the food relative to the sun, and the length of the waggle shows the distance. Karl von Frisch decoded this language and shared the 1973 Nobel Prize for it.
Bumblebee Bombus terrestris
Bumblebees learned to roll a ball into a goal for a sugar reward after watching a trained bee do it. Then they improved on what they had seen, choosing the closest ball instead of the one used in the demonstration.
Cleaner wrasse Labroides dimidiatus
Cleaner wrasses given a mirror stopped attacking their reflection, then tried to scrape off a coloured mark placed where they could only see it in the mirror. Some scientists count this as passing the mirror test; others, including the test’s inventor, dispute it. The debate itself shows how hard it is to measure another mind.
Rat Rattus norvegicus
Rats in Berlin learned to play hide-and-seek with researchers, both hiding and seeking. Their only reward was playful tickling. While hiding they stayed quiet, and they chirped with excitement when they found the researcher or were found.
Clark’s nutcracker Nucifraga columbiana
Each autumn a Clark’s nutcracker buries tens of thousands of pine seeds in thousands of small caches across the landscape, then finds many of them again months later, often under snow.
Pigeon Columba livia
In a 1995 study, pigeons learned to tell paintings by Monet from paintings by Picasso, then correctly sorted works by the same artists they had never seen. They even generalised: Cézanne and Renoir went with Monet, Braque and Matisse with Picasso.
Neurons in the cerebral cortex (in birds, the pallium), the part of the brain where much flexible thinking happens. More neurons is not the same as more intelligence, but it raises a real question: what are all those neurons doing?
It depends on what you mean by “smart”, and that is exactly the point. Here is what science can say, and where it has to stop.
There is no single scale of intelligence. Every species is shaped by the problems its ancestors had to solve, and many beat us at specific tasks: chimpanzees at flash memory, nutcrackers at remembering places, bees at navigating by polarised light.
So far, no other animal has been shown to have a language like ours, able to combine words into unlimited new meanings, or a culture that builds up over thousands of generations the way human knowledge does.
A long-finned pilot whale has more than twice as many neurons in its cortex as you do. We do not know what it does with them.
Sperm whale codas have a structure we are only beginning to describe. Projects such as Project CETI and the Earth Species Project are using recordings and machine learning to try to understand animal communication.
Every animal lives in its own sensory world, which scientists call its Umwelt: bats hear in echoes, sharks sense electric fields, bees see ultraviolet. A mind built around senses we lack may be intelligent in ways our tests cannot see.
Scientists are careful here for a reason. It is easy to read human feelings into animals, and just as easy to underestimate them. That tension is what makes this field so exciting.
Follow the research:Project CETI ↗Earth Species Project ↗Umwelt ↗Animal cognition ↗
Six real findings. Can you guess the animal?
Hi, I’m Luca. I’m named after LUCA, the population of single cells from which all life today descends. Pick a question about this page.
There is no single ladder. Complex minds evolved separately at least four times: in primates, in whales and dolphins, in crows and parrots, and in octopuses, each suited to a different way of life.
Show me ↓Something close. Each bottlenose dolphin has its own signature whistle, and when another dolphin copies it, the owner answers, which suggests the whistles work as labels. Whether sperm whale clicks work like a language is still being studied; so far no animal has been shown to have a language like ours.
Show me ↓At some tasks, perhaps. A young chimpanzee named Ayumu beat university students at a memory game in which numbers flash for about a fifth of a second, though people who practised later did as well. Clark’s nutcrackers find thousands of hidden seed caches months later. Each mind is tuned to its own world, so “smarter” depends on the task.
Show me ↓Octopuses do surprising things: the coconut octopus carries shell halves around to use later as a shelter, which counts as tool use. About two-thirds of an octopus’s roughly 500 million neurons are in its arms. Our last shared ancestor lived over 700 million years ago and probably had only a simple nervous system, so the octopus built its mind on its own.
Show me ↓Short answers based on the text of this page and its sources.
fromLUCA LUCA is the last universal common ancestor: the population of single cells from which all life on Earth today descends. It lived roughly four billion years ago; estimates differ.
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