Why was there people on islands like australia and new zealand when Noah's arc never landed there?

For example on islands like Madagascar, Australia, Indonesia, Papua new guinea, New Zealand, the Americas and all the other island where there is no land bridges. They weren't discovered until a few hundred year back, but when they were discovered, they already had native inhabitants, where did they come from... show more For example on islands like Madagascar, Australia, Indonesia, Papua new guinea, New Zealand, the Americas and all the other island where there is no land bridges. They weren't discovered until a few hundred year back, but when they were discovered, they already had native inhabitants, where did they come from if Noah's Arc only landed in Turkey? And how do Native animals exist if they all landed in the same spot, or Kangaroos swam back to Australia?
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