Figure 23.27: Arachnid Diversity (A) Known for their web-spinning abilities, spiders are expert predators. (B) A desert scorpion assumes the animal’s aggressive attack position. These arachnids are fearsome predators, and their sting can be dangerous to humans. (C) Harvestmen, also called daddy longlegs, are scavengers. (D) Mites include many free-living species as well as blood-sucking, external parasites.