Wakaleo schouteni is an extinct marsupial that once lived in Australia. It is closely related to the marsupial lion, "Thylacoleo carnifex", which lived until 30,000 years ago. "Wakaleo schouteni" is estimated to have become extinct about 19 million years ago.. It was the size of a small dog, and would have weighed about 23 kg. Scientists have estimated it is one of the oldest known members of the marsupial lion family.