Spiders crawl the web

Spiders are predatory invertebrate animals that have two body segments, eight legs, no chewing mouth parts and no wings.
The study of spiders is called araneology.All spiders produce silk, a thin, strong protein strand extruded by the spider from spinnerets most commonly found on the end of the abdomen. Many species use it to trap insects in webs.
There are also many species that hunt freely. Silk can be used to aid in climbing, form smooth walls for burrows, build egg sacs, wrap prey, and temporarily hold sperm, among other applications.
There are about 350 species which can inject venom to protect themselves or to kill prey. Only about 200 species, however, have bites that can pose health problems to humans. Many larger species' bites may be quite painful, but will not produce lasting health concerns.
Spiders are found all over the world, from the tropics to the Arctic, living underwater in silken domes they supply with air, and on the tops of mountains.
In 1973 Skylab 3 took two spiders into space to test their web-spinning capabilities in zero gravity.
Google search engines actually have a type of code that is called a spider, crawler, or robot. These search engines send their crawlers out to scan the web and bring back websites to add to the index. The internet works on a system of hyper links and spiders use these hyper links to crawl the web.