A spider can easily recognized because it has eight legs.
Scorpions, harvestmen, ticks, and in fact all arachnids - not just spiders - have four pairs of legs. Insects have three pairs.
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Spider "infestations" should be controlled with pesticides.
Doctors can always tell what spider bit you from the bite alone.
Some spiders are deadly.
Tarantulas are dangerous or deadly to humans.
Some spiders are poisonous and others are not.