Researchers from the University of Chicago and the Field Museum of Natural History have found a striking lack of diversity in the earliest known fossil bird fauna – the Jehol aviafauna. This early bird, Longipteryx, lived during the early Cretaceous period approximately 120 million years ago. Image credit: Allison Elaine Johnson. “There were no swans, no swallows, no herons, nothing like that,” explained Jonathan Mitchell, a PhD student at the...