The western black widow. This spider is usually a glossy black, although it can appear to be brown or dark purple. It may have the red hourglass shape on its underside, but it might have two ...

Brown widow spiders are believed to have originated in either Africa or South America but they have spread all over the world. They were first seen in Florida in 1935.

Brown widow spiders, which are invasive to North America, are wiping out black widow populations in the U.S. by aggressively attacking them for no clear reason, a new study shows.

Brown widows — a closely related species — arrived in Florida around 1935, probably from South Africa. A single mother produces multiple egg sacs and potentially thousands of spiderlings.

Brown widow spiders are believed to have originated in either Africa or South America but they have spread all over the world. They were first seen in Florida in 1935.

Black widows are vanishing from certain regions of the U.S. Scientists found that a competitor, the brown widow, may largely be to blame for the iconic arachnid's decline.

When spotting the difference between brown and black widows, there are a few ways to differentiate between them. Brown widows live in open areas while black widows hide in dark corners and crevices.

The five most harmful spiders in California are the Western black widow spider, brown widow spider, yellow sac spider, desert ...

Brown widow spiders are believed to have originated in either Africa or South America but they have spread all over the world. They were first seen in Florida in 1935.

Western black widow spiderlings, for example, are brown with a white, black-spotted abdomen. As baby black widows mature, their appearance gradually changes, and the females eventually develop the ...

Black widow spiders (right) are commonly being displaced by the brown widow spiders (left), a fellow species in the same genus, Latrodectus. The Images are not shown to matching scale and thus do ...