Eggs   | Small caterpillars |   Large caterpillars |   Chrysalis |   Hatching |   Old age

A final molt exposes the wall of the chrysalis, which shrinks in size, hardens, and becomes emerald green. Within its envelope caterpillar tissue is rearranged into the body of a butterfly.

A monarch chrysalis is likened to an emerald jewel. But biologists are unsure about the function of its gold dots. CLICK TO LEARN MORE

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