Acarnania spider webs Warmer weather conditions in Greece have led to a unique 300-metre long spider-web covering a beach in Aitoliko, Acarnania. According to reports, a vast area of greenery has been covered by the web and experts claim it is a seasonal phenomenon, caused by Tetragnatha spiders, which can build large nests for mating. There are hundreds of species of these spiders that live in various parts of the world. An increase in the mosquito population is also thought to have contributed to the rise in the number of spiders. Maria Chatzaki, professor of molecular biology and genetics at Democritus University of Thrace, said high temperatures, sufficient humidity and food created the ideal conditions for the species to reproduce in large numbers. "It's as if the spiders are taking advantage of these conditions and are having a kind of a party,” she told Greek media. "These spiders are not dangerous for humans and will not cause any damage to the area's flora. The spiders will have their party and will soon die,” added Maria. Wildlife experts say it's not uncommon for spiders to build massive nests for mating, especially when it's hot and humid towards the end of summer.