53 minutes ago Simon Atkinson, Melbourne and Claire Keenan PA The Duke and Duchess of Sussex are shown a Marngrook, a possum skin ball used to play traditional Aboriginal games. The Duke and Duchess of Sussex have taken a journey through First Nations Australians' history in Melbourne on day three of their visit to the country. Prince Harry and Meghan joined an Aboriginal walking tour on Thursday called the Scar Tree Walk, an important cultural heritage site experience in the city. Led by local Indigenous guides, the couple walked along the Birrarung, which is the traditional name for Melbourne's Yarra river. The couple, who are no longer working royals, are touring Australia in a private capacity and have combined visits to charitable causes with commercial ventures. As part of the tour, which began at Koorie Heritage Trust in Melbourne's Federation Square, the duke and duchess got to handle a Marngrook.…