Every year we did a unit on the life cycle of Monarch butterflies. We read books on life cycles and how the Monarchs migrated like birds every year. I ordered the catepillars and we had a butterfly house. We released them after about 2 weeks. I ordered them around Easter so that it would be warm enough to release them in May. This is a great sequencing and hands-on learning activity to go along with the unit. Enjoy!