The Chacoan naked-tailed armadillo (Cabassous chacoensis) is a species of South American armadillo. It is the smallest of the naked-tailed armadillos, having an average head-body length of 30 cm (12 in), while the other species range from 32 to 46 cm (13 to 18 in). They also have smaller ears than the other species, and their ears also have a distinctive fleshy expansion on the forward edge that other species lack.