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Because it was separated from other land masses for such a long time in Earth's history, life has evolved in Australia along a different path. Marsupials are more common there for example. Only in Australia do you find a mammal that lays eggs and has a poisonous reptilian spike (duck-billed platypus).

Being poisonous or fierce is an evolutionary strategy for survival. The fact that Australia has many deadly species is just the way it is.

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