![]() ![]() The most familiar dodecahedron is the regular dodecahedron with regular pentagons as faces, which is a Platonic solid. In geometry, a dodecahedron (from Ancient Greek δωδεκάεδρον ( dōdekáedron) from δώδεκα ( dṓdeka) 'twelve', and ἕδρα ( hédra) 'base, seat, face') or duodecahedron is any polyhedron with twelve flat faces. It is not to be confused with Roman dodecahedron. But as of yet, there's not a good hypothesis for this atypical feature.This article is about the three-dimensional shape. The researchers also discovered an unusual curvature of the dodo's semicircular canal - the balance organs located in the ear. "This really underscores the need for the maintenance and growth of natural history collections, because who knows what's next." "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. 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. 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 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. ![]() Of course, there's more to intelligence than just overall brain size, but this gives us a basic measure." "So if you take brain size as a proxy for intelligence, dodos probably had a similar intelligence level to pigeons. "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. When comparing the size of the birds' brains to their body sizes, Gold and collaborators found that the dodo was "right on the line." 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). Out of these scans, Gold built virtual brain endocasts to determine the overall brain size as well as the size of various structures. 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. 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. ![]() This is partly because dodo specimens are extremely rare, having disappeared during the nascent stage of natural history collections. Today, they are almost exclusively known for becoming extinct, and I think that's why we've given them this reputation of being dumb."Įven 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. "Because of that behavior and invasive species that were introduced to the island, they disappeared in less than 100 years after humans arrived. "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. The dodo ( Raphus cucullatus) was a large, flightless bird that lived on the island of Mauritius in the Indian Ocean. ![]()
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