An extraordinarily huge spider web has been found in the Dallas suburb of Rowlett, with webs draping the trees “like shrouds,” said a local entomologist as reported by Discovery News.

It’s taking place on CA Roan Drive in the town, with webs up to 40 feet into the trees and untold thousands of spiders inhabiting them — a rare sight, but not completely unknown.

So what spiders build such massive webs? Scientists don’t know for sure, although they believe a spider in the Tetragnathidae family is probably responsible.

It’s not the first time such massive webs have been found in Texas. There was also a giant web in 2007 in Lake Tawkoni State Park that many people reported, causing spider experts to flock to the area. It was apparently a large group of spiders that were working together to build this massive web, and it was a surprise to scientists.

The species is named Tetragnatha guatemalensis, and there have been past instances of it building webs in cooperation with other spiders, a rare event consider that spiders tend to be loners. Also known as the Guatemalan long-jawed orb weaver, it’s a long, gangly spider that is capable of spinning large webs and can grow to be quite large. They can be social spiders that share their webs with other species of arachnids and even insects. They make up most of the inhabitants of such webs, with probably millions of spiders making up the biggest webs, but there are many other types of species within them.

Although they are an unnerving sight to arachnophobes everywhere, they are completely harmless, and therefore it is unnecessary to use insecticides on the trees.