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How to kill a venomous spider
Spot black widows by their red hourglass mark.
If you see a black spider in or near your home that has a bright red hourglass marking on its abdomen, you've spotted a black widow spider. These are extremely dangerous and are potentially fatally venomous.
Be extra careful around the outside of your home if you live in a temperate climate and have woodpiles; black widows are most frequently found there. Look out for brown recluses' violin-like mark.