Morio worms are sometimes known as superworms. They are a large species of mealworm growing to around 60 mm long. They are a very popular food for insectivorous species of reptiles (particularly bearded dragons!), amphibians, invertebrates, birds, and mammals.


Zophobas morio is a species of Darkling Beetle, whose larvae are known by the common name Superworms, King Worms, Morio Worms, or simply Zophobas.

The insect’s larvae resemble very large mealworms, about 50 to 60 mm (1.7 – 2.25 in) long when full size, but unlike mealworms, the ends of their bodies are very dark, almost resembling a black color. They have 6 small legs and two rudimentary hind prolegs. Once they reach adult size, the larvae pupate, and later emerge as large, light-coloured beetles, which in time darken to black beetles. The larvae will not pupate if kept in a container with many other larvae and plentiful food, where they receive constant bodily contact. Keeping Superworms this way is commonly used to hinder pupation. To mature the Superworms into darkling beetles, they must be kept alone for about 7 – 10 days. They will then, upon maturation, emerge from their pupal stage as darkling beetles.

Superworms are accepted by lizards, turtles, frogs, salamanders, birds, koi, and other insectivorous animals, as well as pet ants. Their nutritional values are similar to those of mealworms, so it is possible that supplementation with calcium is necessary if they are used as a staple food item. In some cases they are preferred over mealworms due to their softer exoskeleton, making them more digestible to some reptiles. The larvae are odor-free (but the beetles possess a pungent chemical defense that may be released when provoked) and can be easily contained, making them ideal for raising at home to feed a collection of captive insectivores. The nutritional profile of the Zophobas morio is 46.80% proteins, 43.64% lipids, 8.17% ashes, and 1.39% carbohydrates.

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