The data suggest that all modern rodents descend from a common ancestor that had thumbnails too. This early rodent ancestor's thumbnails may help explain how rodents took over the world. The ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. While humans are Earth’s most dominant animal species, it’s ...

Humans and many rodents share one feature in common that may come as a shock: thumbnails. Most people would think that rodents only have sharp claws, but the majority of these mammals actually have ...

Rodents may have a rule of thumbnails. Many rodents have curved claws that help the animals climb or dig. But most also have flat nails on their thumbs, researchers report in the Sept. 4 Science. This ...

Researchers discovered a previously unknown species of rodent that lives along the foothills of the Andes in Argentina. Distinguished by its long claws and brightly-colored teeth, the species was ...

Researchers (left to right) Gordon Shepherd, Anderson Feijó, Lauren Johnson, and Rafaela Missagia, working in the Field Museum’s mammal collections. Picture a squirrel eating an acorn. It’s holding ...