The first stage of metamorphosis for the Monarch Butterfly is the pupation of the caterpillar into its chrysalis. The caterpillar attaches itself to a surface using a hook-covered appendage called a cremaster. Once firmly secured, the caterpillar sheds its skin to reveal the hard-skinned chrysalis. Once metamorphosis is complete, the adult butterfly emerges from the chrysalis.
Source: https://youtu.be/ocWgSgMGxOc
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