what is it called when a caterpillar turns into a butterfly

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Nature

Metamorphosis.

  • What it is called: The process is called metamorphosis, specifically complete metamorphosis, as seen in butterflies and moths. During this process, a larva (caterpillar) is transformed into an adult butterfly through a pupal stage (chrysalis for butterflies, cocoon for many moths) where tissues are reorganized into adult structures. This biological term and its stages are widely described in science resources.
  • Why it happens: The transformation allows caterpillars and adult butterflies to exploit different ecological niches and foods, reducing competition between life stages. Hormonal changes drive tissue breakdown and reorganization, guiding the development of wings, eyes, antennae, and other adult features.

If you’d like, I can give a quick, kid-friendly explanation or a simple diagram of the four life stages.