スミソニアン博物館さんのインスタグラム写真 - (スミソニアン博物館Instagram)「We don’t recommend pulling this little fella from its burrow to see if there’ll be six more weeks of winter. This is Ceratogaulus hatcheri, an extinct groundhog relative that lived about 6 million years ago in what is now Kansas, from @smithsoniannmnh's collection. It may have used those horns for self-defense. Today, its closest living relative is the mountain beaver Aplodontia rufa. Both species reside with groundhogs, squirrels, prairie dogs and chipmunks in a group of rodents called the Sciuromorpha.」2月2日 21時51分