Poisonous spiders live all over the world. Poisonous spiders possess poison to kill their prey. These spiders breathe air. When a water spider web has few air bubbles, the spider surfaces, and catches air bubbles on its hairs, then swims back to its web to release them. If a spider loses a leg, it's just a matter of time until it grows another leg.
Some water spiders can walk on water without sinking.
These spiders capture insects and eat them in the water. Water spiders are sometimes considered to be in a separate family called Argyronetidae. To eat, spiders inject their prey with enzymes and dissolve them. To move, spiders pump and remove blood into and from their legs. Spiders mainly produce silk to spin webs.