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In page Arachnophobia:

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By ensuring that their surroundings were free from spiders, arachnophobes would have had a reduced risk of being bitten in ancestral environments, giving them a slight advantage over non-arachnophobes in terms of survival.[citation needed] However, having a disproportionate fear of spiders in comparison to other, potentially dangerous creatures[4] present during Homo sapiens' environment of evolutionary adaptiveness may have had drawbacks.[citation needed]