A group of spiders is called a cluster or a clutter. These terms are used to describe a collection of spiders that are found together in one place. While spiders are generally solitary creatures, certain species may come together in groups for specific reasons such as mating or to share a common food source.
For example, some species of spiders, like the Anelosimus eximius, are known to live in large communal webs where they cooperate in capturing prey and raising their young. In such cases, the term cluster or clutter aptly describes their grouping.
It’s important to note that not all spiders form groups, and the majority of spider species prefer to live and hunt alone. However, when they do come together, the terms cluster or clutter are used to describe their collective presence.