An article published in the journal “PeerJ” describes the study of some bones of a primitive bird that lived about 75 million years ago in today’s Utah. Nemed Mirarce eatoni, it belonged to the family of enantiornithines, primitive birds that lived in the Cretaceous period and then died out with dinosaurs. This species shows characteristics similar to those of modern birds that show flight skills equivalent to theirs but this makes it even more difficult to understand the reasons for the extinction of the enantiornithines.