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Spiders are quite small and can get through cracks. However with big spiders, they can get through via the roof, vents, ducts and chimneys. Or when you have those small spiders getting in via the cracks and then hiding from sight for a prolonged period of time (1 year), until they grow to a fairly large size. You generally won't see these spiders as they can survive without food from a couple of weeks to more than a year.

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13y ago

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