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How to identify a black widow spider
Look for red markings on female black widows.
Female black widows are best known for the red spots on their bellies. A black widow may have a connected red hourglass shape on the underbelly, or two triangles that don't touch in a slight hourglass shape.
One type of black widow has a row of reddish dots instead of the hourglass shape that the species is known for. There is a lot of variation in the coloring of black widows.