We couldn't very well do an article on scary spiders and leave out the black widow, could we? Latrodectus Hesperus, which is found in temperate regions throughout the world, has a bulbous body and a distinctive, hourglass-shaped mark on its abdomen. It is just 1.5 inches (38 millimeters) in length, but its size is deceptive. The spider's venom reportedly is 15 times stronger than that of a rattlesnake, and if the creature bites you, the result is achy muscles, nausea and a paralysis of the diaphragm that can make breathing difficult.
Fortunately, most people who are bitten by black widows don't suffer any serious or permanent injury, though the venom can be fatal to small children, the elderly or people in poor health. Black widows are most infamous for their violent macabre mating behavior, in which females sometimes kill and eat their mates after copulation. And you thought "Love Hurts" was just an old heavy metal song [source: National Geographic].