Usually, it takes 1-2 weeks for a caterpillar to change into a butterfly. The main process that happens inside the cucoon occurs after the caterpillar is 2-3 weeks old. The image below shows the caterpillar preparing to begin the transformation.
Butterflies have four life stages. They begin as a tiny egg. Then they emerge from the egg as a caterpillar (larvae stage). Caterpillars eat a lot during this stage in order to grow big and strong. This stage lasts for a few weeks. Then they build a chrysalis (pupa stage) and stay in there all winter. In the spring, they emerge as a butterfly.
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