One specimen is enough of a sample to tell what spiders live in a house.
A typical human dwelling may also be home to 10-30 different spider species. One specimen isn't going to tell you much.
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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.