Spiders

Spiders belong to the class Arachnida. Like all arachnids, spiders have just two body regions, a cephalothorax, and an abdomen. In spiders, these two body regions join at a narrow waist, called a pedicel. The abdomen is soft and unsegmented, while the cephalothorax is harder and includes the eight legs that spiders are known for. Most spiders have eight simple eyes, although some have less or even none at all. Spiders prey on other organisms, usually insects. Spiders use a wide range of strategies to capture prey: trapping it in sticky webs, lassoing it with sticky balls, mimicking the prey to avoid detection or running it down. Most detect prey mainly by sensing vibrations, but active hunters have acute vision.