How would you feel about owning a one-hundred-and-forty-pound guinea pig in your house? That’s essentially what the capybara is. The largest living rodent in the world is semi-aquatic, spending lots of time both on the sea and land. Capybaras can be adorable, but buyers beware–capybaras are illegal to own in certain states and are often very territorial. Only experienced animal lovers should consider owning one.