They are the only group of animals which make such complicated webs to capture their prey. There are a variety of ways in which spiders use their webs — and, more generally, their silk — to capture their prey. Some use gobs of silk like trap lines, and some make trapdoor nests with their silk and pop out to surprise prey. I know there are some “glowworms” in caves that use sticky mucous-covered silk to capture prey, but I haven’t been able to dig up any other animals that can be said to use “nets” the same way spiders do — except, of course, for human beings.
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