Are Butterflies Two Different Animals in One?

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Here's a dangerous, crazy thought from an otherwise sober (and very eminent) biologist, Bernd Heinrich. He's thinking about moths and butterflies, and how they radically change shape as they grow, from little wormy, caterpillar critters to airborne beauties. Why, he wondered, do these flying animals begin their lives as wingless, crawling worms? Baby ducks have wings. Baby bats have wings. Why not baby butterflies?
His answer: The radical change that occurs does indeed arguably involve death followed by reincarnation. The adult forms of these insects are actually new organisms.