Not the great marine biologist himself, unfortunately, but his definitive study of reef-building corals of Australia.

FORBES: Is the Great Barrier Reef Doomed? One of the World's Leading Coral Scientists Thinks So

Patch reef: small colonies of corals, sometimes less than 10 m (33 ft) in diameter.

UNESCO: L O S S A R Y

Every place you look, from corals in great barrier reef, to polar bear tracks.

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Diving on the Great Barrier Reef for several days, I saw a bewildering variety of corals in every shape and size.

FORBES: Is the Great Barrier Reef Doomed? One of the World's Leading Coral Scientists Thinks So

Coral reef: complex tropical marine ecosystem dominated by soft and stony (hard) corals, anemones and sea fans.

UNESCO: L O S S A R Y

Stony corals are microscopic animals with an outer skeleton of calcium carbonate that form colonies and are responsible for reef-building.

UNESCO: L O S S A R Y