Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of very many genetically identical …

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.

Nov 4, 2025 · 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.

Nov 21, 2024 · There are about 6,000 species of coral around the world, with some species growing in warm shallow waters near coastlines and others thriving on the dark, cold seafloor of the open …

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, …

Millions of people and species of wildlife depend on coral reefs. While climate change threatens their future, science shows that corals can adapt and survive if we keep them healthy.

Today’s stony corals are split into two main groups. The first group includes the familiar shallow water corals, recognizable by their bright colors. These corals tend to live in colonies and form symbiotic …

6 days ago · Coral bleaching from ocean warming devastates marine ecosystems, threatening 25% of ocean species, but restoration and heat-resistant corals offer hope.

3 days ago · In an underwater nursery just off the Dominican Republic coast, tiny corals born in a laboratory are slowly growing under the eye of conservationists.

Coral organisms, called polyps, can live on their own, but are primarily associated with the spectacularly diverse limestone communities, or reefs, they construct. Coral polyps are tiny,...