human
I have a question about raising butterflies. Why do I have to keep the butterfly in a dark box?
assistant
Butterflies are nocturnal, so they need to be kept in a dark box to avoid being eaten by predators.  They also need to be kept in a warm, humid environment, so they can regulate their body temperature.  You can find more information about butterfly care here: https://www.butterfly-conservation.org/butterfly-care/