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I suspect it is originating from the mud. This has some plastic bits with it. They are spreading all over my walls. I think it is some kind of cocoon for worm. Should it's rapid growth in terms of number be a matter of concern? found in Bangalore, India, this is a close up shot. I noticed that white worm popped out after i put some alcohol on it.

It is sticking on the wall and the grip is very firm

There are many more

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Bagworms? https://en.wikipedia.org/wiki/Bagworm_moth I don't know how destructive individual species are. They probably aren't more than an aesthetic concern.

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