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Spiders are predatory invertebrate animals that
have two body segments, eight legs, no chewing mouth
parts and no wings. They are classified in the order
Araneae, one of several orders within the larger
class of arachnids, a group which also contains
scorpions, whip scorpions, mites, ticks, and opiliones
(harvestmen). The study of spiders is known as arachnology.
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, although 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... |
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