Webbing clothes moths (Tineola bisselliella) begin their lives each as an egg about 0.3 millimeters wide. From there, they hatch into tiny, hungry, cream-colored caterpillars (such as shown here) that spin silk as they munch. When they are ready to pupate, they are about as long as a grain of rice, and about the same color. They sneakily construct their cocoons of silk and bits of substrate (i.e., whatever they’re feeding on), making them hard to spot. (Photo by Isabel Novick)