Caribbean coral (IMAGE) Arizona State University Caption Staghorn coral can form dense groups called 'thickets' in very shallow water, providing important habitat for other reef animals, especially fish. Elkhorn coral, along with staghorn coral and star corals built Caribbean coral reefs over the last 5,000 years. Credit NOAA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.