Superworms (Zophobas morio) can be used to add variety to your pets diet, this is key in a well balanced diet. Be sure to use superworms along with our other prey items like silkworms! Superworms should be kept in read bran, oats, or similar grain bedding with gutload and water source. Do not refrigerate superworms this will kill them. Superworms are 2" in length and 1/4" in diameter.