There are about 35,000 species of spider worldwide. They are characterized by four pairs of legs and an unsegmented furry or polished "abdomen". They all produce a poison in their fangs that acts as a neurotoxin. They also produce silk from their spinnerets though not all build webs. They are predators, catch their prey in various ways, immobilize it with their venom and then suck out the body fluids.
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- Spiders of Northwest Europe Images and descriptions of over 220 species commonly found in northwestern Europe, especially the area between the Netherlands and the south of France. A subsection features 190 pictures of Australian spiders.
- Spiders of Belgium Biology, ecology, life history, and images of spiders, as well as a key to Belgian spiders. In Flemish and English.
- Steve's Aussie Spider Pics Photo gallery of spiders found in the Alice Springs area, Australia.
- Nick's Spiders Large photo gallery and notes about the spiders of Britain, Europe, and North America.
- Spiders of Wisconsin List of species found in this state with estimated populations. Includes some photos.
- Araneae: Spiders The characteristics of these creatures, their life cycle, feeding and habitat, with illustrations.
- Ants, Beetles and Spiders Article by David Richman on the mimicry adopted by some spiders in the order Araneae making them resemble certain unpalatable ants and beetles.
- Spider India Blog for enthusiasts who want to share information and photographs of the spiders found in India.
- Worldwide Database of Jumping Spiders: Salticidae Dr. Heiko Metzner includes morphology, taxonomy, distribution, publications, descriptions and illustrations of a large number of species.
- Araneae Photograph gallery of many different spider species listed by family.
- Spiders of Queensland Identification, description, habitat, and toxicity of common spiders in Queensland, Australia. Includes section on the Australian Redback Spider (Latrodectus hasseltii).
- Spiders of Brisbane Photographs and notes from the Brisbane area of Queensland, Australia.
- Spider Collector's Journal Rod Crawford's narratives of scientific spider collecting expeditions; recent ones include photo albums of habitats and specimens.
- The World Spider Catalog by Norman I. Platnick Detailed taxonomic information about the spider families.
- Spiders.us Community providing spider identification services for primarily North American spiders. Members of the public can submit photographs and submit and help identify pictures of spiders.
- Spiders of the Netherlands Database of species occurring in the Netherlands, arranged by family, genus, and species. Identification characteristics, as well as one or more photos for many species.
- Spider Myths Site This site lists the common myths about spiders and debunks them; illustrated.
- Spider Webring Web ring for spider lovers.