However, a few is enough. Some spiders may be poisonous to some animals but only a few are poisonous to humans. As you may know, spiders are not insects, they are arachnids. They have fangs, and devour their food from the inside out, sucking out the insides. It is also with their fangs that they inject their venom.
Black widows are by far the most common poisonous spider bite in the United States.
Black Widow Spiders are most common in the tropics and the Southern United States, but have been reported as far north as Canada. They spin an irregular web in crevices and dark places. They have long legs and dark, black bodies. The female is the poisonous one, the male is smaller with no marking and harmless. The female's distinctive marking is a red hourglass shape on her abdomen.