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a creature that eats so violently it gets to rebuild its own body from scratch

means The immature, often wormlike feeding stage of an insect or other animal, between egg and adult, before it transforms into its final form.

from From Latin larva, meaning 'ghost, specter' — and also 'mask.' The Romans used it for a haunting spirit; the great 18th-century naturalist Linnaeus borrowed it for biology, the idea being that the immature form is a kind of mask hiding the adult creature yet to come.

appetitecaterpillars can eat 27,000 times their birth weight
total resetsome dissolve into goo before becoming adults
memorymoths recall things learned as caterpillars
latin rootsmeans ghost or mask, the hidden true form
lifespansome beetles stay larvae for decades underground
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