What is a coral polyp?
A polyp is an animal. Most polyps are tiny and live in clusters called ‘colonies.’ Polyps may have hard or soft skeletons. Of the 2,400 living species of corals worldwide, two-thirds of the known coral species have soft skeletons, while one-third of the species have hard skeletons. The type of polyp determines the size and shape of the colony. Some colonies look like “trees” while another colony may look like a brain!
When polyps with hard skeletons die, their tiny bones create a rock called ‘limestone.’ Coral reefs are made of limestone or the crushed bones of many, many millions of hard polyps! Reef-building corals include: Mushroom Coral, Staghorn Coral, Brain Coral, Bubble Coral, Chalice or Lettace Coral, and Tree or Tube Coral.