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A share of every tropical white beach is coral that was eaten by a fish and passed straight through.

Earth Science Facts, sourced to NOAA.

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Parrotfish bite chunks off a reef to reach the algae growing in it, grind the coral skeleton with teeth in their throats, and excrete what is left as fine white carbonate sand. A single large fish can produce hundreds of pounds of it in a year. Sand elsewhere has a duller origin, mostly quartz that survived the weathering of granite because it is hard and chemically dull, which is why so many beaches are pale yellow.

The claim comes from NOAA.

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