What is the largest Megafauna species?

The giant rhino-sized Diprotodon  is the symbol of Australian megafauna as well as the largest marsupial ever discovered.  Beautifully preserved fossil remains from dozens of individual Diprotodon have been found from around the Eulo area. The most famous Eulo  specimen is known as ‘Kenny’ and is one of the largest of its kind.  Diprotodons had a backward facing pouch capable of carrying a single giant joey, huge tusk-like incisors and were pigeon toed.  It has been suggested that the bunyip, a  large mythical creature from Aboriginal mythology, said to lurk in swamps, billabongs, creek and waterholes, may be a cultural memory of the Diprotodon.