A speleological expedition discovered something worthy of a horror film on the border between Albania and Greece: the largest spider web ever recorded. Found inside a deep cave known as the Sulfur Cave, the structure is impressive in its dimensions, measuring more than 106 square meters, the equivalent of a semi-detached house, housing a colony of around 110 thousand spiders.
The cave environment is anything but ordinary. The yellowish walls and the air filled with hydrogen sulfide gas reveal a peculiar ecosystem, formed by the reaction between underground water and oxygen, which generates sulfuric acid and corrodes the rocks. It was in this hostile scenario that two species, the Tegenaria domestica (house spider) and the Prinerigone vagans (leaf weaver), decided to cohabit.
The most surprising thing is not just the size of the web, but the collaborative behavior between species that, under normal conditions, would be predators of each other. According to researcher Jason Dunlop, from the Natural History Museum in Berlin, the explanation lies in the abundance of food inside the cave. Tiny insects feed on microbial slime generated by sulfur-consuming bacteria, which provides enough food for both species to coexist peacefully.
The study, published in the scientific journal Subterranean Biology, presents a new perspective on social behaviors among spiders in extreme environments. The team estimated population density by counting the number of spiders in various sections of the web and multiplying the results by the total area. The conclusion was surprising: more than 100,000 spiders live in harmony in the depths of this Albanian cave.
