The monach butterfly lays an egg on the under side of a leaf. It hatches and then a little two mm baby caterpillar cames out of the egg. It goes to eat some milk weed leaves and grodually grows full size over two weeks.
When the caterpillar is nice and fat it will then attach its self to a twig up side down and changes in to a chrysalis. It takes a few weeks before you begin to see it crack. The chrysalis cracks open and a buttefly cames out.
The butterfly has to wait for its wings to dry and stiffen before they can fly.