👉 Octodontidae is a group of extinct mammals that lived during the Late Cretaceous period, around 120-75 million years ago. This group includes some of the most iconic and recognizable animals from the dinosaur era, including mammoths, woolly rhinos, and giant woolly mammoths. The term "octodontidae" comes from the Greek word "octodon," which means "four-legged." The group is named after the four legs that were