Squirrels belong to the order rodentia, and more than 40 percent of all mammals are rodents as well. Back in the day, when it seemed all mammals were huge (think saber-toothed tigers and wolly mammoths), rodents were much bigger, too. But because of a lack of evidence, scientists didn’t know just how huge.
Until now. An almost intact skull of the Dinomyidae species was found on a beach in Uruguay, and scientists guess that the animal weighed at least a ton, and was about the size of a small car. Could you imagine that living in your walls?