What are black soldier fly larvae (NutriGrubs)?

Black soldier fly larvae (BSFL for short) are the larvae of the black soldier fly, Hermetia illucens. They look like maggots, although segmented with sparse, bristle-like hairs. Despite their appearance, these grubs are popular feeders for pet reptiles, amphibians, invertebrates, and others due to their high nutrient value and low maintenance needs.