The Beaver was a popular answer but incorrect. It is actually the Capybara. The Capybara is twice as big—the largest rodent on Earth. These impressive semi-aquatic mammals are found throughout much of northern and central South America.
Recently a small invasive population has been seen in Florida, (I did NOT make it up; it is fact).
The invasive Floridian rodents have been nicknamed The Trumps. (OK, for that one I may have difficulty providing a credible source).