The female adult butterfly lays a Small egg.On the underside of the leafe.After a few weeks later The caterpillar hatches. After it hatches it starts eating its shell to get nutrients.It eats Milkweed leaves to get fat.While it is eating it also starts shedding its skin After while, it is prepared and finds a branch to hang on upside Down into a chrysalis.After a few weeks or days the chrysalis changes couler.It finally it pulls it self out of the shell and.It is a butterfly