[5] Tenebrio obscurus larvae resemble very small mealworms.

Larvae are cylindrical and initially white, darkening as they mature.

[6] Larvae then pupate, and later emerge as small, black beetles, 12 to 18 millimetres (0.47 to 0.71 in) long.

They may have a lighter brown color[6] or appear dull rather than shiny.

[7] Mini mealworm larvae are used as a feeder insect for birds, reptile and amphibian pets, and zoo animals.