The answer to the crossword question “Most spiders have eight of them” is EYES. Spiders typically have eight eyes which are located on the front part of their cephalothorax. These eyes are arranged in two rows, with the larger pair in the middle and smaller pairs on either side. The arrangement of the eyes can vary depending on the species of spider, but having eight eyes is a common trait among most spiders. The eyes of a spider play an important role in their survival, helping them to hunt prey and detect danger from predators.