A grey squirrel sitting on a log holding an acorn in its two paws. Thumbnails likely played a key role in rodents’ evolutionary success. Instead of sharp, pointy claws, several rodent species ...

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 ...

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 ...

Today, only one species of the spiny dormouse survives, in southern India. However, the oldest spiny dormouse in evolutionary history, a member of the rodent family, was found in sediment dating back ...