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Butterfly Eggs — Just The Facts

1. Eggs are usually laid on tender young leaves or buds
2. Eggs are attached to a leaf using an adhesive-like substance that glues the egg to the plant leaf
3. The butterfly's eggs usually hatches after 3 to 8 days

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When the egg hatches, a “larva” or “caterpillar” emerges. Caterpillars must grow quickly, so they eat continually. When the caterpillar reaches full size, they form into a “chrysalis” or “pupa.”

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When the caterpillar reaches full size, they form into a “chrysalis” or “pupa.” Inside, they are undergoing a transformation or “metamorphosis.” The parts we recognize as a butterfly are beginning to form.

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The process of a butterfly emerging from its chrysalis is called eclosion. Eclosion is controlled by hormones. These hormones are released to soften the chrysalis and to trigger the central nervous system begin the movements needed to complete the emergence process.

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The adult stage is what most people think of when they think of butterflies. They look very different from the larva. The caterpillar has a few tiny eyes, stubby legs and very short antennae. The adults have long legs, long antennae, and compound eyes. They can also fly by using their large and colorful wings. The one thing they can't do is grow.