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Adult female butterfly lays an egg on a milkweed p[lant
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Over about 10 days the caterpillar eats a massive amount of leaves and grows fat.
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The pupa changes colour over time from green to blue and then to black when you can see the butterfly's colouring.
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When the butterfly is ready to hatch you can see its colours through the translucent pupa.
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Over a few hours the butterly dries its wings. It is now ready to fly away and begin a new cycle.