1. The Great Barrier Reed is considered to be the "largest living structure on earth".2. To make solid tentacles, coral extracts calcium carbonate from the ocean.
3. Much of the construction of the coral is due to red algae. It acts like pink glue and cements fragments of shell, sand and coral with sheets of calcium carbonate.
4. The Great Barrier Reef was established as a national park in 1975
5. About 33% of the reef is protected from fishing.
6. Scientists believe that the current reef is about 20 thousand years old, but they have found that the ancient coral is about half a million years old.
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