Black Widows

Black Widow spiders inhabit most of the warmer regions of the world to a latitude of about 45 degrees N. and S. They occur throughout all four deserts of the American Southwest. All widows are venomous, though not all can cause injury to humans. The female black widow spider, though it is the most venomous spider in North America, seldom causes death as it injects a very small amount of poison when it bites. Reports indicate human mortality at well less than 1% from black widow spider bites. Anyone bitten by a black widow spider should seek medical care; an attempt should be made to catch the spider for identification.

Both Western and Eastern Black Widows spin webs that lack shape and form. Their webs are erratic in appearance, and the silk is stronger than almost all other arachnids. The webs are rough and sticky. The black widow spider is shy and nocturnal in habit, usually staying hidden in her web, hanging belly upward. Although not aggressive, she may rush out and bite when her web is disturbed or when accidentally jostled.

Widow spiders generally nest on the underside of ledges, rocks, plants and debris, wherever a web can be strung. Cold weather and drought may drive these spiders into buildings. Like most arachnids, the Black Widow preys on insects. Prey caught in the web includes a variety of insects (cockroaches and beetles) and other arthropods. After ensnaring its prey in the web, the Black Widow makes small punctures in the victim's body and sucks out the liquid contents.

After mating, the female then lays several batches, containing up to 750 eggs each, in one summer. The egg case, about 1/2 inch in diameter, is suspended in the web. It is white to tan in color and has a paper-like texture. There may be 4 to 9 egg sacs produced during a summer. Normally, only 1 to 12 young survive after the egg incubation period of 14 to 30 days due to cannibalism.

The young Black Widows are colored orange and white when they emerge 1 to 4 weeks later. The female Black Widow may live for more than a year and a half. Growth requires 2 to 4 months, depending on availability of prey during which the females molt 6 to 8 times and the males 3 to 6 times. Females mature about 90 days after egg sac emergence and live another 6 months to a year. Males mature about 70 days after emergence and live only another month or two.

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