Corals are colonial marine invertebrates within the subphylum Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the …

This tutorial is an overview of the biology of and threats to coral reefs, as well as efforts being made to conserve and protect them. It includes images, animations, and videos.

May 22, 2026 · Coral, any of a variety of invertebrate marine organisms of the class Anthozoa that are characterized by skeletons—external or internal—of a stonelike, horny, or leathery consistency.

Corals are small marine animals. The “hard” type of coral grows with the help of algae, which gives it color and nutrients that help it form a sturdy, stony skeleton. Reefs, which form through the …

At its core, a coral is an invertebrate animal belonging to the phylum Cnidaria, which also includes jellyfish and sea anemones. Each individual coral is a small, soft-bodied polyp, typically cylindrical in …

Nov 22, 2021 · Corals form true reefs when they grow close together and deposit layer after layer of limestone, several feet high. Many different kinds of fish depend on coral reefs for food and …

Coral organisms are called polyps, which are very small and soft animals related to jellyfish and sea anemones. Coral polyps are cylindrical shaped, with a mouth at the end that’s surrounded by barbed, …

Corals are in fact small animals, called polyps, in the shape of sea minnows that can form colonies. These polyps make a common skeleton which for some species become the foundation of a coral reef.

Coral reefs are at the center of many coastal and island cultures around the world. For example, in the Kumulipo, the Hawaiian creation chant, the coral polyp was the first organism created, and from that …

Jan 27, 2026 · Many people think of coral as hard, rock-like formations that attract abundant, diverse marine life. In fact, corals are tiny marine animals called polyps that live together in colonies.