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The Black Widow Spider There are three distinct species of the black widow spider in the United States and all three are poisonous. There is the Southern black widow, the Western black widow, and the Northern black widow. While these spiders are not large, their venom is extremely dangerous to humans and other animals.Do all black widows have hourglass?
Not all adult black widows exhibit the red hourglass on the ventrum underside or top of the abdomen — some may have a pair of red spots or have no marking at all. Female black widows often exhibit various red markings on the dorsal or top side of the abdomen, commonly two red spots.Are black widow spiders really dangerous?
The venom of the black widow spider is 15 times as toxic as the venom of the prairie rattlesnake. Only the female Black Widow is dangerous to humans; males and juveniles are harmless. More than 35,000 spider species of spiders occur in the World.