For four centuries, the dodo has served as the specific animal humans reach for when we want to describe stupidity.
Its name has entered multiple languages as an insult. Political cartoons draw dodos when they want to picture someone incapable of adapting to their circumstances. Dictionary definitions of the word “dodo” list “a stupid person” as a secondary meaning. Nobody has actually known whether the reputation was deserved — the last living dodo died sometime in the late 17th century, and every image and description we have of the bird was written by the sailors who killed and ate them.
A specific paper published on August 5, 2026 in the Zoological Journal of the Linnean Society has, using modern imaging techniques on three of the only complete dodo skulls left in the world, provided the closest thing yet to an honest answer.
The dodo was not stupid. It was, apparently, something rather stranger.
What the researchers actually did
Only two complete dodo skulls are known to exist anywhere in the world. One is held at the Natural History Museum of Denmark. The other is at the Oxford University Museum of Natural History. A third, damaged but reconstructable, is held at the Smithsonian Institution.
An international team led by Sara Citron and Andrew Iwaniuk at Canada’s University of Lethbridge, working with researchers from Flinders University, the Smithsonian, National Museums Scotland, the University of Copenhagen, and the Natural History Museum in London, gained access to all three skulls and put them through high-resolution CT scans.
The scans allowed the team to reconstruct the internal shape of the dodo’s braincase — the specific cavity in which the brain had once sat. From that reconstruction, they could measure the relative sizes of specific brain regions and infer how the animal processed sensory information. They also scanned the dodo’s closest relative, the equally extinct Rodrigues Solitaire, and compared both against skulls from eight species of living pigeons and doves.
The specific result the team reports is that the dodo’s brain was not smaller than expected for a bird of its size. Its forebrain — the part associated with cognition and memory in birds — was in the same proportion as in modern pigeons. Whatever the dodo was, it was not cognitively stunted.
What its vision was actually like
The first specific surprise the CT scans revealed was in the visual system.
The dodo’s optic lobes — the specific parts of the brain that process visual information — were substantially smaller than those of typical pigeons and doves. In modern columbiforms, optic tectum makes up around 9.5% of total brain volume. In the dodo, it was much smaller. This is a specific pattern seen in nocturnal or low-light-active birds, including owls, kiwi, the Australian night parrot, and the New Zealand kakapo.
At the same time, the dodo had slightly larger eyes than would be expected for a pigeon of its size. Combined with reduced optic lobe processing, this pattern typically indicates vision optimised for low-light conditions — larger light-gathering surfaces feeding a nervous system that summarises detail rather than resolving it finely.
The high-domed shape of the dodo’s skull is also reminiscent of certain owls, though the specific question of whether its eyes were forward-facing in the owl sense — for binocular depth perception during hunting — is not directly addressed by the current study.
What the visual anatomy suggests, cautiously, is that the dodo was not strictly diurnal. It may have been active at dawn and dusk, in the specific low-light windows most modern pigeons avoid. Whether that activity extended into full night is not established. But the dodo appears to have been the only pigeon in the world adapted for anything other than daylight.
What its nose was actually like
The second finding involves smell.
The dodo’s olfactory bulbs — the parts of the brain responsible for processing odour — appeared enlarged in one of the two intact specimens the team analysed. In that specimen, the olfactory bulbs made up approximately 3.44% of the endocast volume, considerably higher than in typical pigeons. In the other complete specimen, the same measurement came in at 1.36%, only marginally enlarged.
The researchers describe this specific finding as inconclusive in the peer-reviewed paper itself. The two specimens do not agree closely enough to make a strong claim about dodo olfaction as a species-typical trait. Personal variation, preservation differences, or measurement uncertainty could all account for the difference.
That said, the specific direction the evidence points is consistent with earlier work by Maria Gold and colleagues at the American Museum of Natural History in 2016, which used a different dodo specimen and reported enlarged olfactory bulbs. If the pattern holds, the dodo would have been unusually smell-focused among birds — closer, in this respect, to nocturnal fruit-eaters like the kiwi than to typical daytime pigeons.
Alongside this, the specific nerve pathways carrying touch sensation from the dodo’s large upper bill also showed signs of enlargement. The bird appears to have had unusually sensitive tactile perception through its beak — a specific adaptation useful for probing at food in low light where vision alone would not be sufficient.
What this actually changes
The specific popular image of the dodo has always rested on very little.
The bird was described, in a small number of firsthand European accounts from the 17th century, as unafraid of humans and easy to approach. Sailors killed hundreds of them for meat. The last confirmed sightings occurred sometime in the 1680s or 1690s. Every subsequent description of the dodo has been reconstructed from small numbers of surviving specimens and drawings that vary considerably in reliability.
The “stupid” reputation, on close examination, appears to have been mostly a projection. A bird that had spent millions of years evolving on an island with no predators would naturally have been unafraid of humans when they arrived. That trust looked, to European sailors, like foolishness. It was probably just an absence of the specific fear response that would have been useless in the environment the bird actually evolved for.
The Citron et al. 2026 findings do not prove the dodo was clever. They simply establish that its brain was not smaller or less developed than that of any of its close pigeon relatives — many of which are, incidentally, considerably smarter than they look. What the dodo appears to have been is a bird adapted for a specific ecological niche that modern pigeons do not occupy: a large, flightless, low-light-active omnivore that navigated by smell and touch as much as by sight, in a Mauritian forest environment that no longer exists anywhere on Earth.
The reputation was mostly wrong. What the actual bird was doing, alone on its island, is only now starting to come into focus.
