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Dodos might have been quite intelligent, new research finds

X-ray scans reveal that dodo's relative brain size was similar to pigeons, likely had enhanced sense of smell

Date:
February 23, 2016
Source:
American Museum of Natural History
Summary:
New research suggests that the dodo, an extinct bird whose name has entered popular culture as a symbol of stupidity, was actually fairly smart. The work finds that the overall size of the dodo's brain in relation to its body was on par with its closest living relatives: pigeons -- birds whose ability to be trained implies a moderate level of intelligence. The researchers also discovered that the dodo likely had an enhanced sense of smell.
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A model of a dodo that will be on display in the American Museum of Natural History's upcoming exhibition about the relationships between birds and dinosaurs, Dinosaurs Among Us.
Credit: Copyright AMNH/C. Chesek

New research suggests that the dodo, an extinct bird whose name has entered popular culture as a symbol of stupidity, was actually fairly smart. The work, published today in the Zoological Journal of the Linnean Society, finds that the overall size of the dodo's brain in relation to its body size was on par with its closest living relatives: pigeons--birds whose ability to be trained implies a moderate level of intelligence. The researchers also discovered that the dodo had an enlarged olfactory bulb -- the part of the brain responsible for smelling -- an uncharacteristic trait for birds, which usually concentrate their brainpower into eyesight.

The dodo (Raphus cucullatus) was a large, flightless bird that lived on the island of Mauritius in the Indian Ocean. They were last seen in 1662.

"When the island was discovered in the late 1500s, the dodos living there had no fear of humans and they were herded onto boats and used as fresh meat for sailors," said Eugenia Gold, the lead author of the paper, a research associate and recent graduate of the American Museum of Natural History's Richard Gilder Graduate School, and an instructor in the Department of Anatomical Sciences at Stony Brook University. "Because of that behavior and invasive species that were introduced to the island, they disappeared in less than 100 years after humans arrived. Today, they are almost exclusively known for becoming extinct, and I think that's why we've given them this reputation of being dumb."

Even though the birds have become an example of oddity, obsolescence, stupidity, and extinction, and have been featured in popular stories ranging from Alice in Wonderland to Ice Age, most aspects of the dodo's biology are still unknown. This is partly because dodo specimens are extremely rare, having disappeared during the nascent stage of natural history collections.

To examine the brain of the dodo, Gold tracked down a well-preserved skull from the collections of the Natural History Museum, London, and imaged it there with high-resolution computed tomography (CT) scanning. In the American Museum of Natural History's Microscopy and Imaging Facility, she also CT-scanned the skulls of seven species of pigeons -- ranging from the common pigeon found on city streets, Columba livia, to more exotic varieties. Out of these scans, Gold built virtual brain endocasts to determine the overall brain size as well as the size of various structures. Gold's colleagues at the Natural History Museum of Denmark and National Museum of Scotland sent her the endocast for the dodo's closest relative, the extinct island-dwelling bird Rodrigues solitaire (Pezophaps solitaria).

When comparing the size of the birds' brains to their body sizes, Gold and collaborators found that the dodo was "right on the line."

"It's not impressively large or impressively small -- it's exactly the size you would predict it to be for its body size," Gold said. "So if you take brain size as a proxy for intelligence, dodos probably had a similar intelligence level to pigeons. Of course, there's more to intelligence than just overall brain size, but this gives us a basic measure."

The study also revealed that both the dodo and the Rodrigues solitaire, which recently was driven to extinction by human activity, had large and differentiated olfactory bulbs. In general, birds depend much more on sight rather than smell to navigate through their world, and as a result, they tend to have larger optic lobes than olfactory bulbs. The authors suggest that, because dodos and solitaires were ground-dwellers, they relied on smell to find food, which might have included fruit, small land vertebrates, and marine animals like shellfish.

"It is really amazing what new technologies can bring to old museum specimens," said co-author Mark Norell, Macaulay Curator of Paleontology and Chair of the Division of Paleontology at the American Museum of Natural History. "This really underscores the need for the maintenance and growth of natural history collections, because who knows what's next."

The researchers also discovered an unusual curvature of the dodo's semicircular canal -- the balance organs located in the ear. But as of yet, there's not a good hypothesis for this atypical feature.


Story Source:

The above post is reprinted from materials provided by American Museum of Natural History. Note: Materials may be edited for content and length.


Journal Reference:

  1. Maria Eugenia, Leone Gold, Estelle Bourdon Andmark A. Norell. The first endocast of the extinct dodo (Raphus cucullatus) and an anatomical comparison amongst close relatives (Aves, Columbiformes). Zoological Journal of the Linnean, 2016 DOI: 10.1111/zoj.12388

Cite This Page:

American Museum of Natural History. "Dodos might have been quite intelligent, new research finds: X-ray scans reveal that dodo's relative brain size was similar to pigeons, likely had enhanced sense of smell." ScienceDaily. ScienceDaily, 23 February 2016. <www.sciencedaily.com/releases/2016/02/160223143148.htm>.
American Museum of Natural History. (2016, February 23). Dodos might have been quite intelligent, new research finds: X-ray scans reveal that dodo's relative brain size was similar to pigeons, likely had enhanced sense of smell. ScienceDaily. Retrieved July 25, 2016 from www.sciencedaily.com/releases/2016/02/160223143148.htm
American Museum of Natural History. "Dodos might have been quite intelligent, new research finds: X-ray scans reveal that dodo's relative brain size was similar to pigeons, likely had enhanced sense of smell." ScienceDaily. www.sciencedaily.com/releases/2016/02/160223143148.htm (accessed July 25, 2016).

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