09/02/2026
Several people have asked how the Painted Lady butterflies that we released on Saturday got inside their little envelopes safely. 🦋
Like all insects, butterflies are ectotherms, which means that they move more slowly when it's cold. Trained handlers gradually cool the butterflies, which calms them and puts them into a sleep-like rest, and then gently place each one into its own envelope with its wings folded upright. The translucent envelopes are made of a smooth paper called "glassine," which helps to protect the butterfly's delicate wing scales from damage while they are being transported.
To keep the butterflies calm, they are shipped overnight in an insulated container with cold packs. We warmed them up just before release so that they would be ready to fly away.
Painted Ladies do migrate south for the winter, but unlike the milkweed-specific Monarchs, they use more than 100 different host plants, keeping their population large and stable. The caterpillars enjoy everything from hollyhocks and sunflowers to hardy hibiscus and asters.
Thank you to everyone who asked such thoughtful questions, and thanks again to everyone who helped make Saturday’s 100th anniversary butterfly release so special!