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Parrot Fish: The Living Sand Factory

http://www.mindbites.com/lesson/10487 for full video. Each and every grain of sand is made by natural forces, by the actions of winds, waves and volcanoes. But coral sand has a unique life history; it's the only sand on the planet that is made by fish. The industrious parrot fish makes sand every minute of the day and that amounts to nearly one ton per fish per year. The largest parrot fish is responsible for more than half the sand on some coral atolls - a remarkable legacy for any fish.
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