We would read the book The Very Hungry Caterpillar by Eric Carle. After reading the story we would each create our own caterpillar craft. Along with this craft the class would learn and discuss the life cycle of a caterpillar.
Butterfly swap: Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new. (II Corinthians NKJV) DIY Folded Paper Butterfly with tissue paper and pipe cleaners.