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Because land snakes cannot cross wide areas of ocean, some islands did not have snakes until they arrived with humans. When these islands separated from a landmass, the niche of the reptiles was filled by some other animal, such as large birds. Other islands were formed offshore by volcanoes, and while birds could get there, most reptiles and mammals could not.

Notably free of native snakes are New Zealand, Ireland, Iceland, and islands in the Arctic, Antarctic, and remote regions of the other oceans.

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