Subscribe to our newsletter for the latest sci-tech news updates. For hundreds of years, scientists have noticed that some rodents, including squirrels, have thumbnails instead of claws. But no one ...

The humble rodent “thumb” may not seem like an obvious window into evolution, but its keratinized tip – the unguis (hoof, claw, or nail) – turns out to reveal striking insights into rodent history and ...

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 ...