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Because they only have eight legs and have to put them somewhere.

Edit: Spiders that carry babies on their backs do so because they are hunters. Some spiders don't make webs; instead of building a trap and waiting, they ambush and capture their prey. The safest place for babies with no sac or web, is close to their mother, where they can be fed and kept safe.

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13y ago

What else can I help you with?