Scientists say they've discovered a "mega coral" three times bigger than the previous record holder - so huge they initially ...

Coral reefs are like cities under the sea. The structure of the living corals themselves provides homes and hiding places for a huge range of marine life. Professor Ove Hoegh-Guldberg describes ...

Coral reefs consist of hundreds of thousands of coral polyps - marine animal invertebrates with hard calcium carbonate exoskeletons. Different species grow to form a variety of measurements and shapes ...

Corals take a very long time to grow. On average they grow between 0.5 and 2cm per year. The reefs we see today have been growing over the past 5,000 to 10,000 years. Reefs are the largest ...