Butterfly houses provide educational opportunities but raise welfare questions about captive butterfly management, emergence timing, and disease.
Butterflies in captive houses face welfare challenges from overcrowding that causes wing damage through collision. Disease transmission including nuclear polyhedrosis virus spreads quickly in warm humid conditions. Disruption of temperature cues for emergence timing can cause developmental problems. While individual butterfly welfare is uncertain given their limited nervous systems, mass mortality from disease and wing damage indicates poor management. The welfare of caterpillars on host plants in these facilities deserves equal consideration.