Why do spiders molt?
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Expert Answer
Spiders molt to grow better. Their shell cannot expand as the body grows, so as the spider gets bigger it molts, shedding the old shell and growing a new one to fit its size.
Spiders eat less during molting, so the owner can reduce feeding then. Molting speed is affected by air humidity, temperature, and nutrition; during molting keep humidity between 60% and 80%.