answer:Yes. There are monotremes (mammals which lay eggs) – platypii/platypuses(?) and echidnas. “Australia is home to a variety of native mammals both on land and in the surrounding oceans. They consist of marsupials, monotremes and placental mammals. The largest number of the mammals, almost half, are the marsupials, which include the Kangaroo, Koala and Wombat. “The other native land mammals are the bats, rats, mice and the Dingo.” (via)