Drosophila melanogaster and Drosophila hydei (vinegar flies) are suitable live foods for small reptiles, such as geckos and amphibians. Drosophila melanogaster are smaller and ideal for younger reptiles, while Drosophila hydei are larger and better for adults. These flies are a good source of protein, but should be given in moderation and fed before offering to pets to maximize their nutritional value.