Every couple of springs we like to order some Painted Lady caterpillars from Insect Lore and watch then turn into butterflies. The caterpillars come in the mail less than a centimeter long. They grow very fast in about a week. Then they crawl up to the top of the cup and hang in a "J" and start to form their chrysalis. It is fascinating to watch. They stay in the chrysalis for about 7 - 10 days and then come out as beautiful butterflies. We usually keep them a day or two and feed then sugar water or oranges, and then we let them go!