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 ...

Part I: Evolutionary History -- Chapter 1: Two hundred years of studies on plains vizcachas -- Chapter 2: Pan-Chinchillidae, a once diverse clade -- Chapter 3: The fossil record of Lagostomus: a 10 ...

Rodents in Chicago have been adapting to an increasingly urban environment over the past century, a new study has shown. Evolution generally entails seeing small changes passed down over generations, ...