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Researchers have discovered that all kinds of animals -- from sea slugs and caterpillars to songbirds and people -- undergo constant and remarkable physical changes during their lives.
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Many animals have a special ability to transform themselves, for the sake of survival, reproduction, or both.
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Imagine being eaten alive -- from the inside out! That is what happens to any caterpillar unlucky enough to become the nest for an egg laid by a caterpillar wasp.
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