The late Pleistocene extinction of large animals, began around 80 000 years ago. The cause of the debate is divided between evidence for it being human induced and/or climatically controlled. The arguement is further compounded by the timing being different on the various continents. On Australia the main extinction phase appears to be around 60 000 to 40 000 years ago. This coincides with the arrival of humans, but also with shifts in rainfall that may have impacted on ecosystems.