Horned Armadillos and Rafting MonkeysSouth America is home to some of the most distinctive mammals on Earthgiant armadillos, tiny anteaters, the world's largest rodent, and its smallest deer. But the continent once supported a variety of other equally intriguing mammals that have no close living relatives: armored mammals with tail clubs, saber toothed marsupials, and even a swimming sloth. We know of the existence of these peculiar species thanks to South America's rich fossil record,