The grain insect is an insect, while the black soldier fly is an aquatic animal.

1. In insect taxonomy, grains belong to the order Coleoptera, the family Pleuropodidae, the genus Powder Beetle, and the genus Pelepodidae. It is native to North America and was introduced to China from the Soviet Union in the 1950s.

2. Black soldier flies, saprophytic insects of the family Hydropodidae, can feed on livestock manure and domestic waste to produce high-value animal protein feeds. Because of their rapid reproduction, large biomass, and easy absorption and transformation It has the characteristics of high efficiency and good animal palatability, so as to carry out resource utilization. Its larvae are called Phoenix insects and have become as famous resource insects as maggots, mealworms, barley bugs, etc., and have been promoted around the world.