When adult moths hatch from their cocoons they hang on whatever surface that they can cling to, usually the netting cage, and pump a liquid called meconium into the veins in their wings over a few hours.
When the soft, velvelty wings harden they can finally fly, though most tend to remain still: they only have limited energy stores, and moving attracts predators. Males tend to hatch out first, and have much larger antennae and smaller abdomens than the females. Excess meconium is excreted afterwards… so it’s best not to hold a freshly hatched moth immediately!
All images copyright N.Lawrence