When deaths from widow spider bites, it is usually the southern black window to blame. However, a bite from the Southern black widow can cause headaches, nausea, fever, abdominal pain, and hypertension. Toxicity varies, but a bite from this spider most often causes pain and sweating, and sometimes muscle cramps. Widow spiders: The various widow spiders-the eastern and western black widows, the red widow, brown widow, gray widow-all have an easily identified hourglass marking on the abdomen.They are found throughout the south central and midwestern United States. Recluse spiders range in size from 1/4 to 3/8 inch, with a dark violin-shaped marking at the top of the leg attachment. Fortunately, these are also very shy creatures that rarely bite. Bites can cause spreading necrosis to set into tissues, making this a very dangerous spider. Brown recluse spiders: These are the most poisonous of all spiders.(Bee, hornet, and wasp stings, by contrast, kill about 60 people each year.) The spiders to be worried about include: On average, fewer than six people a year are killed from spider bites, out of millions of incidences. Contrary to popular fears, it's quite rare for people to die from spider bites. Spiders usually bite defensively, like bees. Of the 3,000-plus spiders in North America, only about 10 are venomous to any serious degree, and only three species have the potential for fatalities. The Spruce Home Improvement Review Board.
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