It is the Castilianization of the genus Bettongia, from the family Potoroidae. They are marsupials known as rat kangaroos, kangaroo rats, bettongs or gerbils. They are only found in Australia and Tasmania.
Betongia : Genus of mammals didelphope macrópods whose species are commonly called kangaroos gerbils, rat kangaroos or topos kangaroos, living in Australia and Tasmania.