Their egg sacs are different too ... If you've been knowingly bitten by a black widow spider, you can expect mild discomfort at the bite area and immediately seek medical treatment.

These spiders spin large webs in which females suspend a cocoon with hundreds of eggs. Spiderlings disperse soon after they leave their eggs, but the web remains. Black widow spiders also use ...

Like the black widow, the brown widow spider typically ... but the simple fact is that the brown widow spider's egg sacs are visibly unique when compared to any other species.