What produces cobwebs?
“Cobweb” means a spider web; “Cob” is an old English word for spider. It is a common given name to the formless webs spun in buildings by certain species of spiders as well as the larvae of some insects. Most of the tangled webs which annoy people are produced by the small house spider. Cobwebs on the ceiling and in the corners of some houses (not mine, of course) are typically not noticed until they become covered with dust.