Incisivosaurus
In 2009 the holotype skull was scanned and analyzed in three dimensions. The results indicated that Incisivosaurus had fewer bird-like air spaces in the skull bones than later oviraptorosaurs did. It also found that Incisivosaurus had reduced olfactory lobes and expanded optic lobes, like ornithomimids. These features of oviraptorosaurs were similar to those of birds.