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Why is the very hungry caterpillar so dang hungry?

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There once was a very hungry caterpillar that ate and ate and ate...  During certain times of the year you will see caterpillars voraciously gnawing on leaves of various plants in an effort to ingest as much as possible, seemingly never stopping to rest.  Why is it this the case? 

Initially, how does the hatched caterpillar get its energy?

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