The Chrysalis - Metamorphosis Begins

We brought about sixty caterpillars into our classroom. They were very small and super fast. The caterpillars  were very hungry and consumed a lot of food (nutrient). We observed a distinct thickening, as they became larger and more bristley.

The caterpillars spun a silk thread or pad to attach to. They hung from this pad in a 'j' position with their heads hanging downward. Each caterpillar has now formed a chrysalis, which is a brownish or tan colour. The children are all wondering: What is happening inside the chrysalis?