Why it's awesome: These colorful critters don't just dress to the nines to woo their mate. Males also do a sexy shimmy to dazzle the ladies. Measuring no bigger than 0.2 inches (0.5 centimeters ...

Black widows are notorious spiders identified by the colored, hourglass-shaped mark on their abdomens. Several species answer to the name, and they are found in temperate regions around the world.