These LARGE worms are approximately 1 1/2"-2" in length (variation exists as they are live animals). Superworms have a soft chit, or exoskeleton, that makes them easy to digest, and a feisty demeanor that will provide a fun challenge for your pet. Superworms should be kept at room temperature (NEVER refrigerate them) and typically live for weeks on a basic diet of plain oat or grain and veggie scraps.