However, it later emerged, human beings who are responsible for the extinction of the giant group of animals called megafauna, in Australia.
Megafauna began to decrease in number when humans were present in mainland Sahul, Australia.
Professor Michael Bird, from James Cook University, Queensland, said that a massive manhunt by humans is the most likely cause of the extinction of the megafauna, quoted by the Daily Mail.
"We found that the climate does not lead to things that had never happened before. Meanwhile, the link between human existence and megafauna extinction very closely," wrote Professor Bird in the papers released Friday, February 12th, 2016.
"Right now, the mainland does not have a local animal Sahul measuring more than 40 kg. However, in the Pleistocene, there vertebrate animals weighing up to 3 tons. Carnage gives the idea that people hunt these animals to extinction."
Sahul land now divided into mainland Australia, Tasmania, and New Guinea.
Australian megafauna in the Pleistocene era, 1.8 million to 45,000 years ago. Among animals, there is a creature resembling a wombat two meters tall, weighing three tons, kangaroo pug weighing 230 kg, and a giant bird that can not fly.
Bird said, "Scientists do not necessarily say that the man came in and commit mass murder against all the animals."
However, when the population changes, things like hunting, take eggs and kill animals can easily occur and give effect to everything.
Papers that could be considered controversial, because breaking the old notion that the climate is drier to be the cause of the extinction of animals.
Bird said the 16 experts working in the paper that combines physical evidence known to the climate record of the period and the history of human migration to the continent of Australia.
Papers published in the journal Proceedings of the Royal Society B.
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