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spider web arachnid insect silk net crawl venom species habitat legs fangs predators entomology spiderweb trap webbing pests invertebrate predatory house brown tarantula orb black widow spiderling silkproducing webslinging predator insectivore mite funnel ecology eightlegged spiderbite crawler arachnology spiderwebs behavior spinnerets trapdoor webmaker venomous