Spider-Man is one of the most popular superheroes, but very few want to have a real spider in their homes and their webs are welcome only if it’s a Halloween decoration. Arachnids are not insects, but they’re on this list since they’re not very dear to humans either and yet they play an important role around us.
Most species that live with men are not dangerous or aggressive. They live in habitats where there is life and they’re important for the ecosystem, mainly as predators of insects and other spiders. If extinguished, flies and mosquitoes, that in some cases are carriers of diseases, would become a plague without a break.