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Asked by emmamcmullan to Shane, Karen, Angela on 11 Nov 2013.
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Karen McCarthy answered on 11 Nov 2013:
Ok first of all, I really hate spiders, so this is a horrible question for me to think about! But anyway, from what I know, there are essentially two groups of spiders ; indoor and outdoor. Those that are indoor are more suited to the heat and conditions of inside a house, so they typically lay their eggs inside there too. Many spiders also leave their babies look after themselves once they hatch, so my guess is maybe half of the new babies can still survive inside the house?
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Shane Mc Guinness answered on 11 Nov 2013:
Yep, temperature is very important for how they breed. Things generally grow better in warmer conditions that suit them. That’s why they come into the house right?! But also because its safer to lay your eggs. Find a quiet spot, which is warm, dark and hidden. A house sounds perfect! However, a lot less than half will survive this. Especially for spiders, there are so many things that eat them. Rodents, birds, larger spiders, foxes, badgers, hedgehogs, the list goes on! Most will die before they can lay eggs of their own. Why is probably a good thing for those afraid of spiders!
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Angela Stevenson answered on 11 Nov 2013:
That’s some great observational skills Emma! Spiders are usually born in the spring – they come out of their egg sacs as soon as the weather gets warm. The mother spider may guard her babies for some time by carrying them around on her back or by building a protective “nursery web” for them. but like most kids, the spiderlings will eventually leave their mother to establish their own webs 🙂 so, how many eggs do they lay? hundreds! ewwww (Karen, I agree, spiders are gross!). Apparently there’s a 98% mortality rate among spiderlings… which probably explains why we don’t see hundreds of nasty little spiders in our house. Hope that helps 🙂
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