the arrival of humans is still debated; with some authors maintaining that only a minority of such fauna remained by the time the first humans settled on the mainland. One of the most important advocates of human role, Tim Flannery, author of the book Future Eaters, was also heavily criticised for his conclusions. A surprisingly late date of 33-37 kya is known for a Zygomaturus specimen from the Willandra Lakes Region in New South Wales, the latest known date for any Australian Megafauna. This is well after aboriginal arrival in Australia around 50 kya. A 2021 study found that the rate of extinction of Australia's megafauna is rather unusual, with some more generalistic species having gone extinct earlier while highly specialised ones having become extinct later or even still surviving today. A mosaic cause of extinction with different anthropogenic and environmental pressures was proposed. Living Australian megafauna The term "megafauna" is usually applied to large animals (over ). In Australia, however, megafauna were never as large as those found on other continents, and so a more lenient criterion of over is often applied. Mammals The red kangaroo (Osphranter rufus) grows up to tall and weighs up to 85 kg (187 lb). Females grow up to tall and weigh up to 35 kg (77 lb). Tails on both males and females can be up to long. The eastern grey kangaroos (Macropus giganteus). Although a male typically weighs around 66 kg (145 lb) and stand almost tall, the scientific name Macropus giganteus (gigantic large-foot) is misleading, as the red kangaroo living in the semi-arid inland is larger. The antilopine kangaroo (Osphranter antilopinus), sometimes called the antilopine wallaroo or the antilopine wallaby, is a species of macropod found in northern Australia at Cape York Peninsula in Queensland, the Top End of the Northern Territory, and the Kimberley region of Western Australia. can weigh as much as and grow over long. Common wombats (Vombatus ursinus) can reach . They thrive in Eastern Australia and Tasmania, preferring temperate forests and highland regions. Birds The emu (Dromaius novaehollandiae) The southern cassowary (Casuarius casuarius) Reptiles Goannas, being predatory lizards, are often quite large or bulky, with sharp teeth and claws. The largest extant goanna is the perentie (Varanus giganteus), which can grow over in length. However, not all goannas are gargantuan: pygmy goannas may be smaller than a man's arm. A healthy adult male saltwater crocodile (Crocodylus