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A venomous spider bite (like this brown recluse bite) can cause a red or purplish rash radiating from the site of the bite. There are only a few species of spiders in the U.S. that can bite humans.
There are a few larger spider species, including wolf spiders and fishing spiders, that might get aggressive and bite humans if they're provoked. But bites from these spiders aren't dangerous.
“In general, spiders will bite only if they can’t get away from you, or are protecting their babies and don’t want to leave the babies behind, and/or they are being crushed or otherwise hurt ...
A spider bite, also known as arachnidism, is an injury resulting from the bite of a spider. The effects of most bites are not serious. [1] Most bites result in mild symptoms around the area of the bite. [1] Rarely they may produce a necrotic skin wound or severe pain. [2]: 455 Most spiders do not cause bites that are of importance. [1]
Nesticodes rufipes is a small red-bodied spider, venomous, but not harmful to humans. [3] They can be extremely common inside homes, building webs in dark corners and under furniture. They have been observed preying on insects such as mosquitoes, [ 4 ] flies, [ 5 ] and ants.
The Australian funnel-web spiders (family Atracidae), such as the Sydney funnel-web spider Atrax robustus (a mygalomorph spider, not to be confused with the araneomorph funnel-weaver or grass spiders) are regarded as among the most venomous in the world. They react vigorously to threats and, reputedly, will more often attempt to bite than run away.
“Black widow spiders are black and shiny with a telltale red hourglass marking on their abdomen,” says Fredericks. “Female black widow spiders are known to be aggressive and bite in defense ...
Although the male spider's venom seems to be more potent, male spider bites cause mild transient effects in dogs and cats. Most primates, including humans, appear to be extremely sensitive to the funnel-web spider's venom. [7] The LD 50 in mice of the male spiders crude venom was found to be 11.3 mg/kg. The female spiders venom was found to be ...