An early giant emerges
In the desolate, arid landscape of modern-day South Australia lies evidence of a much lusher past. Fossils recovered from the sediments of ancient Lake Ngapakaldi belong to Ngapakaldia bonythoni, a sheep-sized marsupial that lived approximately 25 million years ago during the late Oligocene epoch. This creature was an early member of the diprotodontids, a family of herbivorous marsupials that would eventually include the largest marsupial of all time, the three-tonne Diprotodon. Ngapakaldia itself was a hefty animal for its time, weighing up to 200 kilograms.
Its robust, rhino-like build has earned it the nickname 'marsupial rhino', but it is more closely related to modern wombats and koalas. Ngapakaldia was one of the first large-bodied browsers in Australia, foreshadowing the megafauna that would follow. Its skeleton shows a mix of features; some are associated with a ground-dwelling lifestyle, while others hint at a possible climbing ability, perhaps a trait inherited from smaller, tree-dwelling ancestors. This combination suggests an animal well-adapted to its environment, capable of foraging on the ground or perhaps stripping branches from low trees.