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The word "fossil" tends to evokes calcified bones or shells — the "hard" body parts of an animal that died long ago. That's partially because it is very rare for soft tissue — literal flesh making up organs — to be preserved for millions of years. Soft tissue tends to decompose, be eaten by predators or scavengers, or get destroyed through forces of geology and/or nature over time.
Yet every so often, some soft tissue does get preserved in fossil form. And when it does, it's an exciting opening for biologists in that it helps them understand how ancient lifeforms functioned.