I set up a pollinator garden in our backyard and after a few weeks of seeing lots of Monarchs and Monarch eggs (but no monarch caterpillars), we brought an egg inside so we'd have a better chance of raising a caterpillar. After about 2 weeks the caterpillar grew from about the size of a pinhead to over 2 inches long and finally got ready to pupate (form the chrysalis). The chrysalis forming (which is what the video is) took about 2 minutes. It hardened over the next few hours and will stay like this until the butterfly is ready to emerge in about 10 days. In the wild, monarch eggs have a 2-5% chance of reaching the butterfly stage, while indoors it is over a 90% chance. Next year, I plan to raise many more indoors in order to do my part in saving the dwindling Monarch population. Green caterpillar puts itself inside its cocoon.