How do the butterfly free themselves out of the pupae?

Butterflies emerge from their pupae by breaking open the pupal case, or chrysalis. 

The process of emerging, or eclosing, typically takes several hours. 

First, the butterfly pumps its wings full of fluid, which helps them to expand and harden. 

Then, the butterfly uses its mandibles to cut through the pupal case. 

Once it has emerged, the butterfly spends some time drying and pumping up its wings before it is ready to fly.

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