The Field Museum in Chicago is home to one of the world's largest collections of mammals, and as rodents make up about 40% of all known mammal species, there are lots and lots of rodent specimens at ...

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 ...

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 ...

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

And instead of the thin, curved claws on the rest of the squirrel's fingers, their thumbs have smooth, flat nails. For hundreds of years, scientists have noticed that some rodents, including squirrels ...