Identification tools
Interactive tools that help narrow a spider sighting to the small set of species consistent with what you observed.
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Trait-based spider identifier
Narrow a spider sighting by selecting observable traits (body shape, color, web type, eye pattern, size, region, habitat). Each axis links to a filtered species list.
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State spider lookup
Browse the documented species, medically significant species, and peak activity season for any of the 50 US states.
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Side-by-side comparison tool
Compare any two species in our comparison dataset trait by trait, with a bottom-line summary written for non-specialists.
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Bite symptom reference
A non-diagnostic reference describing the local and systemic symptom profile of verified widow and recluse envenomations, intended to help readers decide whether to seek medical evaluation. Not a substitute for clinical judgment.
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Spider terminology lookup
Search the site glossary for anatomical, behavioral, taxonomic, and clinical terms used throughout species and topic pages.