Why Do Megafauna Become Extinct
The word mega in megafauna (fig 1: megafauna) means huge, and fauna means animals so when you put it together it means huge animals. Most megafauna were over 40kg and 30% bigger than their relatives who are alive today. They’ve existed for over 11 million years, but then disappeared in a mass extinction 46,000 years ago (Mandy McLauchlan, 2016). There are several ideas of how they became extinct which includes the ill, kill and chill factors. Ill being a disease which infected the megafauna and ultimately killed them off. Kill is where humans come in and hunt down the megafauna until extinction. Finally chill is climate change, which means megafauna couldn’t handle the change in climate.
Climate change is the main reason why megafauna became extinct.
When megafauna were alive the climate was changing. Australia’s climate was cooler, because Australia was attached to Antarctica. Evidence is shown in Hallet Cove because rocks had glacier scratches. A rise in temperature occurred when Gondwana broke up (fig 2), all the animals had to change their ways of living because the climate changed from cold-dry to warm-dry.
The sudden change in
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