A team of paleontologists from China and the United States has described two shrew-sized mammals that lived during the Jurassic period, between 165 and 160 million years ago. This is an illustration of Agilodocodon scansorius (top left) and Docofossor brachydactylus (bottom right). Image credit: April I. Neander / University of Chicago. The first fossil, Agilodocodon scansorius, is the earliest-known tree-dwelling mammaliaform (long-extinct relatives...
