The blue coral (Heliopora coerulea) calls the coral reefs of the Indo-Pacific its home. At a first glance it resembles an ordinary stone coral. However, it is considered one of the last survivors of the group of Octocorallia, which was known solely as a fossil for a long time. Similar forms existed close to the coasts of Europe and Africa around 100 million years ago.

Blue corals, like many of their fellow species, live in colonies. The corals reach a height of about half a meter and can reach a diameter of up to seven meters. The blue coral can only survive in regions where water is constantly at a temperature of 22°C or more. Even if the blue coral prefers warmer areas, it is not spared from environmental influences and global warming. As a rare part of the Great Barrier Reef, it is protected as much as its fellow species.