The black widow and recluse spiders have very toxic venom that can be life threatening to humans. Pigeon spiders of West Africa give very painful bites. There are four main methods that spiders use to capture prey. Sedentary spiders living in silk-lined burrows leap out to capture passing insects. Some spiders, like hunters, go in search of their prey.
Many spiders spin webs to entrap their prey.
All spiders are carnivorous, Most spiders eat insects but a few of the larger species are big enough to prey on small vertebrate animals like mice or small birds. Most spiders' jaws work from side to side. They have toothed edges used in breaking up the prey during feeding. Most spiders have eight simple eyes. The two main eyes of a spider each have a simple lens, and a retina which is made up of light sensitive cells whose surfaces point toward he light as it enters the eye.