Giant mealworms are a great treat in a reptiles or amphibians diet. Giant mealworms are ideal for Bearded dragons, Leopard geckos, Water dragons, Iguanas, and Chameleons as well as wild birds, frogs and even small carnivorous mammals. Large mealworms are rich in protein, providing a much-needed nutritious meal for your reptile pets. However, Giant mealworms also have a high fat content, so they shouldn't be used as a staple food as they can cause your reptile to rapidly gain weight.