I saw this thing yesterday on my window curtain, and I've been wondering what this is. It looks like a dense network of spider web, and the spider inside it is visible. I thought the spider was dead, but I saw the spider making very small movements inside it. So, that made me more curious to know what it is.

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  • $\begingroup$ This is probably made to protect eggs and young spiders, a sort of nest. $\endgroup$ – RHA Oct 31 '18 at 19:02

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