Plants and Animals

Why aren't marsupials found all over the world?

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They were once widespread over the earth, but were displaced in most regions as the more successful placental mammals evolved. The Australian region, which has been isolated from contact with other regions since the Cretaceous period, had almost no native placental mammals, and the marsupials were able to continue their evolution there without competition.

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Similar questions: Why are marsupials only concentrated in certain regions? Why are there no marsupials in South America? Why are there no marsupials in Asia? Why are there no marsupials in Europe? [ Hide these questions ]

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