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.
For spiders, spinning a web is a very difficult procedure. Orb-weavers are the only spiders that spin spiral webs. Funnel web spiders spin funnel-like entrances to their underground or sheltered homes. Trapdoor spiders make trap doors to catch insects. Crab spiders hold their legs similar to how a crab would.