The dodo is an extinct flightless bird whose name has become synonymous with stupidity.
But it turns out that the dodo was no bird brain, but instead a reasonably brainy bird.
Scientists said on Wednesday (local time) they figured out the dodo's brain size and structure based on an analysis of a well-preserved skull from a museum collection.
They determined its brain was not unusually small but rather completely in proportion to its body size.
They also found the dodo may have had a better sense of smell than most birds, with an enlarged olfactory region of the brain. This trait, unusual for birds, probably let it sniff out ripe fruit to eat.
The research suggests the dodo, rather than being stupid, boasted at least the same intelligence as its fellow members of the pigeon and dove family.
"If we take brain size -- or rather, volume, as we measured here -- as a proxy for intelligence, then the dodo was as smart as a common pigeon," palaeontologist Eugenia Gold of Stony Brook University in New York state said. "Common pigeons are actually smarter than they get credit for, as they were trained as message carriers during the world wars."
The dodo lived on the Indian Ocean island of Mauritius. The weird-looking, ground-nesting bird had a pointed beak and rounded head, stood about 1 metre tall and weighed up to about 23kg.
Driven into extinction largely by human hunting, the last dodo was seen in 1662.
Gold said dodos exhibited no fear of humans when people reached Mauritius in the 1500s.
"Why would they fear something they've never seen? They had no natural predators on the islands before humans arrived.
Because of this, sailors herded the birds on to their boats for fresh meat later in their voyages.
"Their willingness to be driven on to the boats is, I think, what led to people thinking they were dumb. It is rather unfair," Gold said.
Palaeontologist Mark Norell of the American Museum of Natural History in New York explained how the dodo got its reputation: "It had a catchy name, had a ridiculous appearance, was flightless, and because of its lack of fear toward humans, probably due to its isolated habitat, made easy prey: traits which easily could have been attributed to stupidity."
But Norell added, "Intelligence is a very hard quantity to measure."
The research was published in the Zoological Journal of the Linnean Society.