For four hundred years the dodo has been the mascot of stupidity, a fat, flightless punchline that supposedly waddled up to sailors and asked to be dinner. A study published on 5 August in the Zoological Journal of the Linnean Society says we owe the bird an apology. The dodo was not thick. It was, in the ways that mattered to a dodo, rather well equipped.
Researchers led by the University of Lethbridge in Canada, with PhD student Sara Citron as lead author and Professor Andrew Iwaniuk as senior author, took the rare surviving dodo skulls (only two complete ones are known to exist anywhere) and put them through a CT scanner, the same kind hospitals use. From the scans they built an endocast, a three-dimensional model of the space the brain once filled, then compared it with a range of living and extinct pigeons, including the Rodrigues solitaire, the dodo’s closest relative and the largest pigeon that ever lived.
The verdict on intelligence: the region governing cognition was exactly the size you would expect for a bird of the dodo’s bulk. Not a genius, then, but perfectly normal. The “bird brain” slur has no anatomical basis.
The surprises were in the senses. The part of the brain handling vision looked less like a daytime pigeon’s and more like an owl’s, tuned for dim light. That hints the dodo may have been crepuscular, active around dawn and dusk rather than baking in the midday Mauritian sun. The olfactory region, the bit that processes smell, was unusually large for a pigeon, suggesting the dodo sniffed out fruit and food rather than relying on eyesight alone. Its big upper beak appears to have been packed with nerves, making it a sensitive tool for touch.
Here is the angle: “stupid” was never a scientific finding. It was PR, written by the people who wiped the bird out. The dodo evolved on an island with no ground predators, so it had no reason to fear a large approaching animal. When Dutch sailors and their pigs, rats and monkeys arrived in the 1600s, that trust was not idiocy, it was the absence of a threat the bird had never met. Within decades it was gone. Calling it dim was a convenient tale that put the blame on the victim.
There is a modern lesson buried in the skull. We are quick to label anything that behaves differently to us as inferior, whether it is an extinct bird or, these days, any creature that fails a test we designed for ourselves. The dodo did not flunk life. It was superbly adapted to a world that we, not it, destroyed.
Next time someone calls you a dodo, take it as a compliment. Keen nose, good night vision, minded its own business until the pigs showed up.
Did you know: the dodo’s closest living relatives are pigeons, which means the ordinary feral pigeon strutting round your local car park is cousin to one of history’s most famous extinct birds.
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