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Voracious Eating as a Caterpillar Monarch butterflies must survive on the food they ate before they went to Mexico for the winter. When a monarch caterpillar eats milkweed, some is stored as fat. A monarch caterpillar that finds plenty of milkweed becomes a big, healthy butterfly with a reserve of fat. This helps a monarch survive the winter. Photo © Journey North     This Season Teachers Kids Orientation Registration Search Copyright 1997-2010 Journey North. All Rights Reserved. Questions or comments? Contact us.