It is not known what the first Australians looked like. The oldest place where humans lived in Australia dates to 55,000 years ago, the Malakunanja II rock shelter in the Northern Territory. The earliest human remains in Australia, found at Lake Mungo in New South Wales, are 15,000 years younger. The bones of people born from 40,000 to 10,000 years ago, show they were more robust, and were more physically varied than later people. Several important archaeological sites reveal information about the life of these people. These sites include Lake Mungo, Kow Swamp, Coobool Creek, Talgai, and Keilor.