The number of legs a spider has can vary depending on the species. Most spiders have eight legs, which is a characteristic feature of arachnids. However, there are exceptions. Some primitive spiders, known as the “Hexapoda,” have six legs. Additionally, there are some rare genetic mutations or anomalies that can result in spiders having a different number of legs, such as seven or even fewer, but these cases are not the norm. In general, when people refer to spiders, they are talking about arachnids with eight legs.